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　テキストをお持ちでない方のために，当日精読することになっている第57節 "Chronological Criteria" (pp. 73--75) の英文を以下に掲載しておきます．古英語期のラテン借用語の年代測定に関するエキサイティングな箇所です．じっくりと予習しておいていただけますと，対談精読実況生中継を楽しく聴くことができると思います．

57. Chronological Criteria.　In order to form an accurate idea of the share that each of these three periods had in extending the resources of the English vocabulary, it is first necessary to determine as closely as possible the date at which each of the borrowed words entered the language. This is naturally somewhat difficult to do, and in the case of some words it is impossible. But in a large number of cases it is possible to assign a word to a given period with a high degree of probability and often with certainty. It will be instructive to pause for a moment to inquire how this is done.
   The evidence that can be employed is of various kinds and naturally of varying value. Most obvious is the appearance of the word in literature. If a given word occurs with fair frequency in texts such as Beowulf, or the poems of Cynewulf, such occurrence indicates that the word has had time to pass into current use and that it came into English not later than the early part of the period of Christian influence. But it does not tell us how much earlier it was known in the language, because the earliest written records in English do not go back beyond the year 700. Moreover, the late appearance of a word in literature is no proof of late adoption. The word may not be the kind of word that would naturally occur very often in literary texts, and so much of Old English literature has been lost that it would be very unsafe to argue about the existence of a word on the basis of existing remains. Some words that are not found recorded before the tenth century (e.g., pīpe 'pipe', cīese 'cheese') can be assigned confidently on other grounds to the period of continental borrowing.
   The character of the word sometimes gives some clue to its date. Some words are obviously learned and point to a time when the church had become well established in the island. On the other hand, the early occurrence of a word in several of the Germanic dialects points to the general circulation of the word in the Germanic territory and its probable adoption by the ancestors of the English on the continent. Testimony of this kind must of course be used with discrimination. A number of words found in Old English and in Old High German, for example, can hardly have been borrowed by either language before the Anglo-Saxons migrated to England but are due to later independent adoption under conditions more or less parallel, brought about by the introduction of Christianity into the two areas. But it can hardly be doubted that a word like copper, which is rare in Old English, was nevertheless borrowed on the continent when we find it in no fewer than six Germanic languages.
   The most conclusive evidence of the date at which a word was borrowed, however, is to be found in the phonetic form of the word. The changes that take place in the sounds of a language can often be dated with some definiteness, and the presence or absence of these changes in a borrowed word constitutes an important test of age. A full account of these changes would carry us far beyond the scope of this book, but one or two examples may serve to illustrate the principle. Thus there occurred in Old English, as in most of the Germanic languages, a change known as i-umlaut. (Umlaut is a German word meaning 'alteration of sound', which in English is sometimes called mutation.) This change affected certain accented vowels and diphthongs (æ, ā, ō, ū, ēa, ēo , and īo) when they were followed in the next syllable by an ī or j. Under such circumstances, æ and a became e, and ō became ē, ā became ǣ, and ū became ȳ. The diphthongs ēa, ēo, īo became īe, later ī, ȳ. Thus *baŋkiz > benc (bench), *mūsiz > mȳs, plural of mūs (mouse), and so forth. The change occurred in English in the course of the seventh century, and when we find it taking place ina word borrowed from Latin, it indicates that the Latin word had been taken into English by that time. Thus Latin monēta (which became *munit in Prehistoric OE) > mynet (a coin, Mod. E. mint) and is an early borrowing. Another change (even earlier) that helps us to date a borrowed word is that known as palatal diphthongization. By this sound change ǣ or ē in early Old English was changed to a diphthong (ēa and īe, respectively) when preceded by certain palatal consonants (ċ, ġ, sc). OE cīese (L. cāseus, chesse) mentioned earlier, shows both i-umlaut and palatal diphthongization (cāseus > *ċǣsi > *ċēasi > *ċīese). In many words, evidence for date is furnished by the sound changes of Vulgar Latin. Thus, for example, an intervocalic p (and p in the combination pr) in the Late Latin of northern Gaul (seventh century) was modified to a sound approximating a v, and the fact that L. cuprum, coprum (copper) appears in OE as copor with the p unchanged indicates a period of borrowing prior to this change (cf. F. cuivre). Again Latin ī changed to e before A.D. 400 so that words like OE biscop (L. episcopus), disc (L. discus), sigel 'brooch' (L. sigillum), and the like, which do not show this change, were borrowed by the English on the continent. But enough has been said to indicate the method and to show that the distribution of the Latin words in Old English among the various periods at which borrowing took place rests not upon guesses, however shrewd, but upon definite facts and upon fairly reliable phonetic inferences.

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　・ Baugh, Albert C. and Thomas Cable. A History of the English Language. 6th ed. London: Routledge, 2013.

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