ðær

slæpan

mōna

there

sleep

moon

OI cel mánaðr mōnað month

Development of Diphthongs

The PG diphthongs (or sequences of monophthongs) [ei, ai, iu, eu, au] — uderwent regular independent changes in Early OE; they took place in all phonetic conditions irrespective of environment. The diphthongs with i-glide were monophthongised into [i:] and [a:], respectively; the diphthongs in u-glide were reflected_a&_long__diphthongs [io:], [eo:] and [au] >[ea:].

If the sounds in PG were not diphthongs but sequences of two separate phonemes, the changes should be defined as phonologisation of vowel sequences. This will mean that these changes increased the number of vowel phonemes in the language. Moreover, they introduced new distinctive features into the vowel system by setting up vowels with diphthongal glides; henceforth, monophthongs were opposed to diphthongs.

All the changes described above were interconnected. Their independence has been interpreted in different ways.

The changes may have started with the fronting of [a] (that is the change of [a] to [æ]), which caused a similar development in the long vowels: [a:]>[æ:], and could also bring about the fronting of [a] in the biphonemic vowel sequence [a + u], which became [æa:], or more precisely [æ: :], with the second element weakened. This weakening as well as the monophthongisation of the sequences in [-i] may have been favoured by the heavy stress on the first sound.

According to other explanations the appearance of the long [a:] from the sequence [a+i] may have stimulated the fronting of long [a:], for this latter change helped to preserve the distinction between two phonemes; cf. OE rod (NE road) and OE ræd('advice') which had not fallen together because while [ai] became [a:] in rad, the original [a:] was narrowed to [æ:] in the word ræd . In this case the fronting of [a:] to [æ:] caused a similar development in the set of short vowels: [a] > [æ], which reinforced the symmetrical pattern of the vowel system.

Another theory connects the transformation of the Early OE vowel system with the rise of nasalised long vowels out of short vowels before nasals and fricative consonants ([a, i, u] plus [m] or [n] plus [x, f, 0 or s]), and the subsequent growth of symmetrical oppositions in the sets of long and short vowels .

Assimilative Vowel Changes: Breaking and Diphthongisation

The tendency to assimilative vowel change, characteristic of later PG and of the OG languages, accounts for many modifications of vowels in Early OE. Under the influence of succeeding and preceding consonants some Early OE monophthongs developed into diphthongs. If a front vowel stood before a velar consonant there developed a short glide between them, as the organs of speech prepared themselves for the transition from one sound to the other. The glide, together with the original monophthong formed a diphthong.

The front vowels [i], [e] and the newly developed [æ], changed into diphthongs with a back glide when they stood before [h], before long (doubled) [ll] or [l] plus another consonant, and before [r] plus other consonants, e.g.: [e]>[eo] in OE deorc, NE dark. The change is known as breaking or fracture. Breaking is dated in Early OE, for in OE texts we find the process already completed: yet it must have taken place later than the vowel changes described above as the new vowel [æ], which appeared some time during the 5th c., could be subjected to breaking under the conditions described.

Breaking produced a new set of vowels in OE – the short diphthongs [ea] and [eo]; they could enter the system as counterparts of the long [ea:], [eo:], which had developed from PG prototypes.

Breaking was unevenly spread among the OE dialects: it was more characteristic of West Saxon than of the Anglian dialects (Mercian and Northumbrian); consequently, in many words, which contain a short diphthong in West Saxon, Anglian dialects have a short monophthong, cf. WS tealde, Mercian talde (NE told).

Diphthongisation of vowels could also be caused by preceding consonants: a glide arose after * palatal consonants as a sort of transition to the succeeding vowel.

After the palatal consonants [k‘], [sk‘] and [j] short and long [e] and [æ] turned into diphthongs with a more front close vowel as their first element, e.g. Early OE * scæmu>OE sceamu (NE shame). In the resulting diphthong the initial [i] or [e] must have been unstressed but later the stress shifted to the first element, which turned into the nucleus of the diphthong, to conform with the structure of OE diphthongs (all of them were falling diphthongs). This process known as "diphthongisation after palatal consonants" occurred some time in the 6th c.

Breaking and diphthongisation are the main sources of short diphthongs in OE. They are of special interest to the historians of English, for OE short diphthongs have no parallels in other OG languages and constitute a specifically OE feature.

The status of short diphthongs in the OE vowel system has aroused much discussion and controversy. On the one hand, short diphthongs are always phonetically conditioned as the)' are found only in certain phonetic environments and appear as positional allophones of respective monophthongs (namely, of those vowels from which they have originated). On the other hand, however, they are similar in quality to the long diphthongs, and their phonemic status is supported by the symmetrical arrangement of the vowel system. Their very growth can be accounted for by the urge of the system to have all its empty positions filled. However, their phonemic status cannot be confirmed by the contrast of minimal pairs: [ea], [æ], [a] as well as [eo] and [e] occur only in complementary distribution, never in identical phonetic conditions to distinguish morphemes; they also occur as variants in different dialects. On these grounds it seems likely that short diphthongs, together with other vowels, make up sets of allophones representing certain phonemes: [a, æ, ea] and [e, eo]. Perhaps the rise of short diphthongs merely reveals a tendency to a symmetrical arrangement of diphthongs in the vowel system, which was never fully realised at the phonemic level.

Palatal Mutation

The OE tendency to positional vowel change is most apparent in the process termed "mutation". Mutation is the change of one vowel to another through the influence of a vowel in the succeeding syllable.

This kind of change occurred in PG when [e] was raised to [i] and [u] could alternate with [o] under the influence of succeeding sounds.

In Early OE, mutations affected numerous vowels and brought about profound changes in the system and use of vowels.

The most important series of vowel mutations, shared in varying degrees by all OE languages (except Gothic), is known as "i-Umlaut" or "palatal mutation". Palatal mutation is the fronting and raising of vowels through the influence of [i] or [j] (the non-syllabic [i]) in the immediately following syllable. The vowel was fronted and made narrower so as to approach the articulation of [i]. Cf. OE an (NE one) with a back vowel in the root and OE ænig(NE any) derived from the same root with the root vowel mutated to a narrower and more front sound under the influence of [i] in the suffix: [a:]>[æ:].

Since the sounds [i] and [j] were common in suffixes and endings, palatal mutation was of very frequent occurrence. Practically all Early OE monophthongs, as well as diphthongs except the closest front vowels [e] and [i] were palatalised in these phonetic conditions.

Due to the reduction of final syllables the conditions, which caused palatal mutation, that is [i] or [j], had disappeared in most words by the age of writing; these sounds were weakened to [e] or were altogether lost (this is seen in all the examples above except ænig).

Of all the vowel changes described, palatal mutation was certainly the most comprehensive process, as it could affect most OE vowels, both long and short, diphthongs and monophthongs. It led to the appearance of new vowels and to numerous instances of merging and splitting of phonemes.

The labialised front vowels [y] and [y:] arose through palatal mutation from [u] and [u:], respectively, and turned into new phonemes, when the conditions that caused them had disappeared. Cf. mus and mys (from the earlier *mysi, where [y:] was an allophone of [u:] before [i]). The diphthongs [ie, ie:] (which could also appear from diphthongisation after palatal consonants) were largely due to palatal mutation and became phonemic in the same way, though soon they were confused with [y, y:]. Other mutated vowels fell together with the existing phonemes, e.g. [oe] from [o] merged with [e, æ:], which arose through palatal mutation, merged with [æ:] from splitting.