Senin, 21 Juli 2014

[S955.Ebook] Free Ebook Experimental Methods in RF Design

Free Ebook Experimental Methods in RF Design

What type of publication Experimental Methods In RF Design you will favor to? Currently, you will certainly not take the printed book. It is your time to get soft data book Experimental Methods In RF Design instead the printed files. You could enjoy this soft file Experimental Methods In RF Design in whenever you anticipate. Also it is in anticipated area as the other do, you can check out the book Experimental Methods In RF Design in your device. Or if you desire much more, you could keep reading your computer system or laptop computer to obtain complete screen leading. Juts find it here by downloading the soft file Experimental Methods In RF Design in web link web page.

Experimental Methods in RF Design

Experimental Methods in RF Design



Experimental Methods in RF Design

Free Ebook Experimental Methods in RF Design

Find out the strategy of doing something from several sources. One of them is this publication qualify Experimental Methods In RF Design It is an effectively understood publication Experimental Methods In RF Design that can be recommendation to review currently. This suggested book is among the all great Experimental Methods In RF Design collections that are in this site. You will certainly also discover various other title and themes from numerous authors to browse here.

By checking out Experimental Methods In RF Design, you could recognize the understanding as well as things even more, not only about exactly what you obtain from individuals to individuals. Schedule Experimental Methods In RF Design will be a lot more trusted. As this Experimental Methods In RF Design, it will truly provide you the good idea to be successful. It is not just for you to be success in particular life; you can be successful in everything. The success can be begun by understanding the standard knowledge and also do actions.

From the mix of expertise as well as activities, somebody could boost their skill as well as ability. It will lead them to live and also work much better. This is why, the students, employees, and even companies should have reading behavior for books. Any kind of book Experimental Methods In RF Design will certainly offer particular knowledge to take all advantages. This is what this Experimental Methods In RF Design tells you. It will add more knowledge of you to life and also work far better. Experimental Methods In RF Design, Try it as well as confirm it.

Based on some encounters of lots of people, it is in fact that reading this Experimental Methods In RF Design can help them to make much better option and also offer even more encounter. If you intend to be one of them, let's acquisition this publication Experimental Methods In RF Design by downloading and install guide on link download in this website. You can get the soft documents of this publication Experimental Methods In RF Design to download as well as put aside in your available digital tools. What are you awaiting? Let get this publication Experimental Methods In RF Design on-line as well as review them in at any time and also any sort of location you will certainly read. It will certainly not encumber you to bring hefty book Experimental Methods In RF Design inside of your bag.

Experimental Methods in RF Design

  • Binding: Paperback

Most helpful customer reviews

See all customer reviews...

Experimental Methods in RF Design PDF
Experimental Methods in RF Design EPub
Experimental Methods in RF Design Doc
Experimental Methods in RF Design iBooks
Experimental Methods in RF Design rtf
Experimental Methods in RF Design Mobipocket
Experimental Methods in RF Design Kindle

[S955.Ebook] Free Ebook Experimental Methods in RF Design Doc

[S955.Ebook] Free Ebook Experimental Methods in RF Design Doc

[S955.Ebook] Free Ebook Experimental Methods in RF Design Doc
[S955.Ebook] Free Ebook Experimental Methods in RF Design Doc

Jumat, 11 Juli 2014

[U331.Ebook] PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation

PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation

Some people may be chuckling when looking at you checking out Island Biogeography: Ecology, Evolution, And Conservation in your extra time. Some may be appreciated of you. As well as some could really want resemble you who have reading pastime. Exactly what about your very own feel? Have you felt right? Reading Island Biogeography: Ecology, Evolution, And Conservation is a need as well as a hobby at the same time. This condition is the on that particular will certainly make you feel that you must read. If you know are looking for guide qualified Island Biogeography: Ecology, Evolution, And Conservation as the choice of reading, you can discover below.

Island Biogeography: Ecology, Evolution, and Conservation

Island Biogeography: Ecology, Evolution, and Conservation



Island Biogeography: Ecology, Evolution, and Conservation

PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation

Island Biogeography: Ecology, Evolution, And Conservation. Join with us to be participant below. This is the site that will certainly offer you ease of browsing book Island Biogeography: Ecology, Evolution, And Conservation to check out. This is not as the other site; the books will certainly remain in the types of soft documents. What advantages of you to be participant of this site? Obtain hundred collections of book connect to download and install and also obtain constantly updated book on a daily basis. As one of the books we will present to you currently is the Island Biogeography: Ecology, Evolution, And Conservation that comes with a very pleased idea.

This Island Biogeography: Ecology, Evolution, And Conservation is really appropriate for you as novice viewers. The visitors will certainly constantly start their reading habit with the preferred style. They could rule out the author and publisher that create the book. This is why, this book Island Biogeography: Ecology, Evolution, And Conservation is really appropriate to read. Nevertheless, the idea that is given in this book Island Biogeography: Ecology, Evolution, And Conservation will reveal you several points. You could start to like also reading until the end of the book Island Biogeography: Ecology, Evolution, And Conservation.

On top of that, we will discuss you guide Island Biogeography: Ecology, Evolution, And Conservation in soft file types. It will not interrupt you making heavy of you bag. You need just computer system tool or gizmo. The link that our company offer in this website is available to click and afterwards download this Island Biogeography: Ecology, Evolution, And Conservation You recognize, having soft data of a book Island Biogeography: Ecology, Evolution, And Conservation to be in your tool can make ease the users. So this way, be an excellent visitor currently!

Just attach to the net to obtain this book Island Biogeography: Ecology, Evolution, And Conservation This is why we suggest you to make use of and also utilize the established innovation. Reviewing book does not imply to bring the published Island Biogeography: Ecology, Evolution, And Conservation Developed modern technology has enabled you to read just the soft data of the book Island Biogeography: Ecology, Evolution, And Conservation It is exact same. You could not have to go as well as obtain conventionally in looking guide Island Biogeography: Ecology, Evolution, And Conservation You may not have enough time to invest, may you? This is why we offer you the most effective method to get guide Island Biogeography: Ecology, Evolution, And Conservation currently!

Island Biogeography: Ecology, Evolution, and Conservation

Will be shipped from US. Brand new copy.

  • Binding: Paperback

Most helpful customer reviews

See all customer reviews...

Island Biogeography: Ecology, Evolution, and Conservation PDF
Island Biogeography: Ecology, Evolution, and Conservation EPub
Island Biogeography: Ecology, Evolution, and Conservation Doc
Island Biogeography: Ecology, Evolution, and Conservation iBooks
Island Biogeography: Ecology, Evolution, and Conservation rtf
Island Biogeography: Ecology, Evolution, and Conservation Mobipocket
Island Biogeography: Ecology, Evolution, and Conservation Kindle

[U331.Ebook] PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation Doc

[U331.Ebook] PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation Doc

[U331.Ebook] PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation Doc
[U331.Ebook] PDF Ebook Island Biogeography: Ecology, Evolution, and Conservation Doc

Senin, 07 Juli 2014

[P937.Ebook] Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer

Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer

For everybody, if you intend to start joining with others to review a book, this Fault-Tolerant Parallel And Distributed SystemsFrom Springer is much advised. And you need to get the book Fault-Tolerant Parallel And Distributed SystemsFrom Springer right here, in the link download that we provide. Why should be right here? If you want various other kind of publications, you will certainly always locate them and Fault-Tolerant Parallel And Distributed SystemsFrom Springer Economics, politics, social, sciences, faiths, Fictions, and also a lot more books are supplied. These offered publications are in the soft data.

Fault-Tolerant Parallel and Distributed SystemsFrom Springer

Fault-Tolerant Parallel and Distributed SystemsFrom Springer



Fault-Tolerant Parallel and Distributed SystemsFrom Springer

Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer

Why must await some days to obtain or receive the book Fault-Tolerant Parallel And Distributed SystemsFrom Springer that you buy? Why should you take it if you could get Fault-Tolerant Parallel And Distributed SystemsFrom Springer the much faster one? You can find the exact same book that you buy right here. This is it the book Fault-Tolerant Parallel And Distributed SystemsFrom Springer that you could get directly after acquiring. This Fault-Tolerant Parallel And Distributed SystemsFrom Springer is popular book in the world, obviously lots of people will aim to have it. Why do not you become the initial? Still perplexed with the way?

The factor of why you could obtain and also get this Fault-Tolerant Parallel And Distributed SystemsFrom Springer faster is that this is the book in soft documents form. You could read the books Fault-Tolerant Parallel And Distributed SystemsFrom Springer wherever you really want also you remain in the bus, workplace, residence, and also other places. Yet, you may not need to move or bring guide Fault-Tolerant Parallel And Distributed SystemsFrom Springer print wherever you go. So, you won't have much heavier bag to lug. This is why your option to make better idea of reading Fault-Tolerant Parallel And Distributed SystemsFrom Springer is truly handy from this case.

Recognizing the method the best ways to get this book Fault-Tolerant Parallel And Distributed SystemsFrom Springer is also important. You have actually been in right website to begin getting this information. Obtain the Fault-Tolerant Parallel And Distributed SystemsFrom Springer web link that we provide here and also check out the web link. You can order the book Fault-Tolerant Parallel And Distributed SystemsFrom Springer or get it as soon as possible. You can swiftly download this Fault-Tolerant Parallel And Distributed SystemsFrom Springer after obtaining deal. So, when you need guide swiftly, you can straight receive it. It's so easy and so fats, right? You must prefer to in this manner.

Merely link your gadget computer system or device to the internet connecting. Obtain the contemporary innovation to make your downloading and install Fault-Tolerant Parallel And Distributed SystemsFrom Springer completed. Also you do not wish to review, you can directly shut the book soft data and open Fault-Tolerant Parallel And Distributed SystemsFrom Springer it later on. You can likewise effortlessly obtain the book almost everywhere, due to the fact that Fault-Tolerant Parallel And Distributed SystemsFrom Springer it remains in your gadget. Or when remaining in the workplace, this Fault-Tolerant Parallel And Distributed SystemsFrom Springer is also suggested to review in your computer device.

Fault-Tolerant Parallel and Distributed SystemsFrom Springer

The most important use of computing in the future will be in the context of the global "digital convergence" where everything becomes digital and every­ thing is inter-networked. The application will be dominated by storage, search, retrieval, analysis, exchange and updating of information in a wide variety of forms. Heavy demands will be placed on systems by many simultaneous re­ quests. And, fundamentally, all this shall be delivered at much higher levels of dependability, integrity and security. Increasingly, large parallel computing systems and networks are providing unique challenges to industry and academia in dependable computing, espe­ cially because of the higher failure rates intrinsic to these systems. The chal­ lenge in the last part of this decade is to build a systems that is both inexpensive and highly available. A machine cluster built of commodity hardware parts, with each node run­ ning an OS instance and a set of applications extended to be fault resilient can satisfy the new stringent high-availability requirements. The focus of this book is to present recent techniques and methods for im­ plementing fault-tolerant parallel and distributed computing systems. Section I, Fault-Tolerant Protocols, considers basic techniques for achieving fault-tolerance in communication protocols for distributed systems, including synchronous and asynchronous group communication, static total causal order­ ing protocols, and fail-aware datagram service that supports communications by time.

  • Sales Rank: #15499538 in Books
  • Published on: 1998-01-31
  • Original language: English
  • Number of items: 1
  • Dimensions: 9.21" h x .94" w x 6.14" l, 1.68 pounds
  • Binding: Hardcover
  • 401 pages

Most helpful customer reviews

See all customer reviews...

Fault-Tolerant Parallel and Distributed SystemsFrom Springer PDF
Fault-Tolerant Parallel and Distributed SystemsFrom Springer EPub
Fault-Tolerant Parallel and Distributed SystemsFrom Springer Doc
Fault-Tolerant Parallel and Distributed SystemsFrom Springer iBooks
Fault-Tolerant Parallel and Distributed SystemsFrom Springer rtf
Fault-Tolerant Parallel and Distributed SystemsFrom Springer Mobipocket
Fault-Tolerant Parallel and Distributed SystemsFrom Springer Kindle

[P937.Ebook] Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer Doc

[P937.Ebook] Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer Doc

[P937.Ebook] Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer Doc
[P937.Ebook] Get Free Ebook Fault-Tolerant Parallel and Distributed SystemsFrom Springer Doc

Rabu, 02 Juli 2014

[C473.Ebook] Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins

Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins

Obtain the advantages of reviewing behavior for your life design. Reserve The Renaissance Of The 12th Century, By Charles Homer Haskins message will certainly constantly associate to the life. The reality, understanding, science, health and wellness, religion, amusement, and also much more could be located in composed publications. Numerous authors offer their encounter, scientific research, research, and all points to share with you. Among them is with this The Renaissance Of The 12th Century, By Charles Homer Haskins This publication The Renaissance Of The 12th Century, By Charles Homer Haskins will offer the needed of message as well as statement of the life. Life will certainly be finished if you recognize a lot more things via reading publications.

The Renaissance of the 12th Century, by Charles  Homer Haskins

The Renaissance of the 12th Century, by Charles Homer Haskins



The Renaissance of the 12th Century, by Charles  Homer Haskins

Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins

Exactly how if there is a site that enables you to look for referred publication The Renaissance Of The 12th Century, By Charles Homer Haskins from throughout the globe author? Instantly, the site will be extraordinary completed. Numerous book collections can be located. All will certainly be so very easy without challenging point to relocate from website to website to get the book The Renaissance Of The 12th Century, By Charles Homer Haskins desired. This is the site that will provide you those assumptions. By following this site you could acquire great deals numbers of book The Renaissance Of The 12th Century, By Charles Homer Haskins collections from versions kinds of author as well as publisher popular in this world. The book such as The Renaissance Of The 12th Century, By Charles Homer Haskins and others can be gotten by clicking nice on web link download.

Poses currently this The Renaissance Of The 12th Century, By Charles Homer Haskins as one of your book collection! Yet, it is not in your bookcase compilations. Why? This is the book The Renaissance Of The 12th Century, By Charles Homer Haskins that is supplied in soft data. You can download and install the soft data of this stunning book The Renaissance Of The 12th Century, By Charles Homer Haskins now as well as in the web link given. Yeah, various with the other individuals that look for book The Renaissance Of The 12th Century, By Charles Homer Haskins outside, you can get easier to present this book. When some individuals still walk into the establishment and browse guide The Renaissance Of The 12th Century, By Charles Homer Haskins, you are right here only stay on your seat and get guide The Renaissance Of The 12th Century, By Charles Homer Haskins.

While the other individuals in the store, they are unsure to locate this The Renaissance Of The 12th Century, By Charles Homer Haskins directly. It may need even more times to go shop by store. This is why we intend you this site. We will certainly supply the most effective way and also reference to get guide The Renaissance Of The 12th Century, By Charles Homer Haskins Even this is soft documents book, it will certainly be simplicity to lug The Renaissance Of The 12th Century, By Charles Homer Haskins anywhere or conserve at home. The difference is that you may not need relocate the book The Renaissance Of The 12th Century, By Charles Homer Haskins place to area. You may need just copy to the other gadgets.

Currently, reading this spectacular The Renaissance Of The 12th Century, By Charles Homer Haskins will certainly be easier unless you get download the soft data here. Merely below! By clicking the connect to download and install The Renaissance Of The 12th Century, By Charles Homer Haskins, you could start to get guide for your own. Be the first owner of this soft documents book The Renaissance Of The 12th Century, By Charles Homer Haskins Make distinction for the others and get the initial to progression for The Renaissance Of The 12th Century, By Charles Homer Haskins Here and now!

The Renaissance of the 12th Century, by Charles  Homer Haskins

Examines the historical background and major cultural developments of the Mediaeval Renaissance.

  • Sales Rank: #340288 in Books
  • Published on: 1972
  • Ingredients: Example Ingredients
  • Number of items: 2
  • Binding: Paperback
  • 437 pages

Most helpful customer reviews

0 of 0 people found the following review helpful.
Five Stars
By Amazon Customer
Very useful book indeed.

34 of 37 people found the following review helpful.
A Good History of an Intellectually Stimulating Historical Era
By James E. Egolf
Charles Homer Haskins' book titled THE RENIASSANCE OF THE TWELFTH CENTURY is a well written, well researched book that refutes the notion that somehow the years between c. 500-1500 AD were "the Dark Ages." Haskins book is "a must read" for those who have an interest in Medieval History.

Haskins presented an interesting thesis about cultuural/intellectual exchanges prior to the 12th.century(1100s). The book challenged the notion that Medieval Europeans were ignorant and unlearned prior to the Crusades (1096-1291). Haskins argued that there were cultural/intellectual exchanges prior to the Crusades espeacially in Southern Italy. The Byzantines Greeks and Arabic Moslems had trade in this area even after the disintegration of Roman Empire. Haskins suggested that the market place of goods was also a "market place of ideas." Gradually such exchanges and ideas penetrated Northern Europe.

Haskins dicussed early Medieval intellectual centers which were concentrated in the monestaries and cathederal schools. The monestaries were in effect beacons of light and learning. A point that other Haskins and other Medieval historians have made is the intellectual debt that Western Civilization owes to the nameless heroic monks and nuns.

The chaper on the production and publication of books is simply an important part of this book. Haskins gave precise details of how the monks hand copied books including the Ancient Clasics and the Bible. He commented that writing/hand copying books was "a labor of love." The monks believed that every word, sentence, and page meant the forgiveness of sins. There is an anecdote whereby one monk wrote one more word than he committed his sins which led to his salvation. The work of book production was so important that those monks who did such work were relieved of physical labor. Often groups of scribes would collaborate to get a book finished, and when the book was finished, there was celebration and a feast. The value of books was very dear. Haskins provided and example whereby in 1043, the Bishop of Barcelona gave a house and land for two books. Books were indeed valuable. The notion that anti-Catholics use that the Catholic authorities did not want people to read the Bible is ludicrous. Haskins stated that Bibles were chained in the cathederals and monestaries to prevent theft. These Bibles were chained to insure their continued use rather than any attempt to restrict their use. Readers must know that just how hard book production was and the arduous efforts involved in such publication efforts.

The teachers and students were also involved in reviving and enhancing the Latin Classics and the Latin language. One must know that the Latin language was the universal language of all teaching, learning, and the Catholic Church. The Latin classics and translations of Greek literature was at first read and learned for moral instuction. Gradually such learning was done for the joy of great literature. While some Catholic authorities were cautious of such learning from pagans, the decision was made to encourage such learning because Catholic authorities did not want ignorant priests and monks.

The introduction of Aristotle's philosophy was an interesting part of this book. Church authorities were concerned of Aristotle's influence corrupting the Catholic Faith. While there were offical restrictions on teaching and learning of Aristotle in the Medieval schools, these were never rigidly enforced. By 1255, such restructions were abondoned. While the Latin Classics were never abandoned, they were reduced in importance by the introduction of Aristotle's logic and dialectic. Haskins cited a Medieval work about the War Between the Liberal Arts and Logic in which Logic won.

The section of the revival of the study of law was also informative. The Medieval Canon Law jurists not only revived Roman Law and developed Canon Law, the Catholic Canon Law jurists developed a "scientific legal system." Roman Law was viewed with suspicion in Medieval England, and Henry II (1154-1189)tried to eliminate such studies. Haskins was very specific to explain that improved studies in Law began in Italy and preceeded Gratian's exhaustive work which was produced c. 1140.

One must ask how so much learning that was written in Greek and Arabic became available in the Latin West. Haskins gave a detailed explanation of the translators who did the translations to make Greek and Arabic knowledge available in the Latin West. Such work must have been taken seriously. Historians have combed a monastary that existed c 1140. Historians discovered texts written in Arabic, Greek,and Hebrew. This undermines the notion that somehow the monks were ignorant and unlearned men.

The chapter on translators was logically followed by the revival of studies of philosophy which became "the handmaid of theology." As one might expect that while there serious studies of Plato's DIALOGUES, Aristotle's philosophy dominated philosophical studies. Yet Haskins made clear, Aristotle could be just as mystical as Plato.

The chapter on universities is thorough. One can glean this topic by reading Haskins book THE RISE OF THE UNIVERSITIES which this reviwer has previously reviewed. Haskins undermined the notion that everyone was forced to think the same which is simply not true. Rarely did the Catholic authorities interfere, and Medieval teachers and students thought of themselve intellectually free. An important part of Medieval teaching and learning was the debates which, according to sources, were lively and spirited. For example, Peter Abelard (1079-1142)wrote a university text titled SIC ET NON (YES AND NO)in which he showed students the apparent contradictions of the Bible, Church Fathers, Catholic Church councils, etc. Abelard did not resolve these apparent contractions, and he used this text to have his students logically resolve these problems. Abelard was never admonished for this book. Further examination of Medieval universities can be learned from the above mentioned book.

Haskins book is a good comparison and contrast of contemporary learning and teaching. Compared to totalitarian regimes and their control over education, this book is refreshing antidote. One must also consider the childish and nonsensical political correct atmosphere of most U.S. unversities which discourages intelligent debate and exchange. Medieval universities encouraged intense learning and debate which was "uninhibited, robust, and wide open." One wonders which age was the "Dark Ages" when comparing the two concepts of teaching and learning. Contemporaries can read and enjoy this book if only as an escape from what many try to pass off as education.

61 of 65 people found the following review helpful.
The Premier Book of Early Middle Ages Research
By A Customer
Despite its age, this book is still the premiere piece fo scholarship on the Twelfth Century. The late Harvard professor Haskins was a master at presenting detailed, insightful research in an easy, accessible manner. Everyone, from the average reader to the advanced researcher will be greatly satisfied with this erudite work.
In this book, which he did throughout all of his career, he presents history in the broader sense: history that is flowing and morphic, not static and pigeonholed. He believed that breaking history up into little arbitrary units of measure, like the century or a decade, while convenient, led to unrealistic expectations of periods or breaks between events, eras, and cultures. History for Professor haskins was very much alive and could not be contained for our convenience, hence it overflowed our self-imposed boundaires, and events which occurred in one era, had their origins far back in time and their ramifications felt far forward in time. Nothing is encapsulated and cut off from the rest of time.
The Renaissance of the Twelfth Century is a very important book, because it recaptures the early Middle Ages from the dustbin of Dark Ages ignorance where all the centuries after the Fall of Rome and the better known Italian Renaissance of the 15th Century are thrown. It proves that scholarship and learning were vigorous, that the liberal arts flourished in towns, cathedrals, monasteries, and the newly founded universities (which is covered much more fully in his book The Rise of the Universities), and therein lay the expansion of the earlier Carolingian scholarship, the salvation of the Latin classics and laws, and rediscovery of Greek philosophy, literature, and sciences, and the influx of Arabic learning that was so influential in the later eruption of learning that led to the greater Renaissances and modern times. He proves however, that there were local origins of learning and that the arts grew very much out of their own cultural bedrocks. These were not ignorant scribes only copying work from far away and a millennia before, but intelligent and resourceful scholars who bettered themselves and their times.
Haskins is a master historian and this book remains a classic of the genre.

See all 4 customer reviews...

The Renaissance of the 12th Century, by Charles Homer Haskins PDF
The Renaissance of the 12th Century, by Charles Homer Haskins EPub
The Renaissance of the 12th Century, by Charles Homer Haskins Doc
The Renaissance of the 12th Century, by Charles Homer Haskins iBooks
The Renaissance of the 12th Century, by Charles Homer Haskins rtf
The Renaissance of the 12th Century, by Charles Homer Haskins Mobipocket
The Renaissance of the 12th Century, by Charles Homer Haskins Kindle

[C473.Ebook] Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins Doc

[C473.Ebook] Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins Doc

[C473.Ebook] Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins Doc
[C473.Ebook] Ebook Download The Renaissance of the 12th Century, by Charles Homer Haskins Doc