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2.5.3. Palatal Mutation (I-mutation)

Palatal mutation is a kind of regressive assimilation caused by the sounds [i] and [j] in the next syllable. This process took place in the VI-VII cc. Under the influence of [i] or [j] the vowels of the preceding syllable moved to a higher front position. Practically all Early OE monophthongs, as well as diphthongs except the closest front vowels [e] and [i] were palatalized in these phonetic conditions.

Monophthongs

1. æ > e *sætian > settan (to set)

2. a > e *namnian > nemnan (to name)

3. ā > ǣ *lārian > lǣran (to teach)

4. o > e *ofstian > efstan (to hurry)

5. ō > ē *wōpian > wepan (to weep)

6. u > y *fullian > fyllan (to fill)

7. ū > ӯmūs > mӯs (mouse, mice)

Diphthongs

1. ea > ie *eald + ira > ieldra (older)

2. ēa > īe *hēah+ ira > hīehra (higher)

3. eo > ie *feohtiþ > fieht (fights)

4. ēo > īe *cēosiþ > cīesþ (chooses)

Thus, i-mutation resulted in seven monophthongs and two diphthongs. By the VII c., the diphthongs were monophthongized.

The palatal mutation has left many traces in ModE. The ensuing vowel interchange serves now to distinguish (1) parts of speech: doom - to deem, food - to feed, blood – to bleed, full – to fill, Angles (Anglo-Saxons) – English, long – length, (2) different forms of a word: tooth – teeth, goose – geese, foot – feet, mouse – mice, old – elder.

2.5.4. Back or Velar Mutation (Velarization)

Back mutation is another regressive assimilation called forth by back vowels (a, o, u) of the following syllable. Under the influence of a, o, u the front vowels i, e, æ of a preceding syllable were diphthongized.

i > io OE silufr > siolufr (later siolfor) (silver), hira > hiora (their)

e > eo OE hefon > heofon (heaven)

æ > ea OE cæru > cearu (care), hæra > heara (hare)

Velarization after the sound [w] results in a single dark vowel.

wi > wu OE widu > wudu (wood)

we > wo OE werold > worold (world)

Back mutation took place in the VII-VIII cc. It was of comparatively small importance for the further development of the English language.

2.5.5. Diphthongization of Vowels after Palatal Consonants

After the palatal consonants [j] (written ʒ) and [k΄] and the cluster [sk΄] (written c, sc) most vowels were diphthongized:

ʒ and c influence only front vowels, while sc influences all vowels

e > ie OE ʒefan > ʒiefan (give)

æ > ea OE *ʒæf > ʒeaf (gave) *cæster > ceaster (camp)

ǣ > ēa OE *ʒǣfon > ʒēafon (pl) (gave)

a > ea OE scacan > sceacan (shake)

o > eo OE scort > sceort (short)

Later on these diphthongs were usually monophthongized again.

2.5.6. Lengthening of Short Vowels

In the IX c. vowels were lengthened before the clusters -nd, -ld, -mb, i.e. before a sonorous consonant plus a voiced plosive:

OE blind > blīnd (blind)

OE wild > wīld (wild)

OE climban > clīmban (climb)

If, however, another consonant followed the cluster, lengthening did not take place, as in cildru (children).

Vowels were also lengthened if the following consonant was lost. Such consonants could fall out:

(a) m or n before f, s,θ; n before h: *fimf > fīf (five)

*uns > ūs (us)

*onþer > ōðer (other)

*þonhte > þōhte (thought)

(b) ʒ [j] before d, n: *sæʒde > sǣde (said), *friʒnan > frīnan (ask)

(c) h between l and a vowel: *seolhas > sēolas (seals)

(d) h in intervocal position : *seohan > sēon (see)