376 THE BRYTHONIC LANGUAGES
penultimate syllables the orthography follows the south, rather than the north. This is the
only point at which the south preserves a distinction now lost in the north, and it is the
only point where the orthography diverges from northern usage.
Diphthongs are represented by a sequence of two vowel symbols, one for the start-
ing point and one for the offglide, and it is the full northern system of diphthongs which
is refl ected in the orthographic system, though there is no systematic marking of length
differences in the initial segment. On the whole the symbols used for simple vowels are
found here too, and the same complications are found over the high central element, be
it in initial position or as an offglide. The initial element / ɨ/ in the diphthong / ɨu/, or /ɪu/
in the south, may be represented by either y or u, as in cyw ‘chick’
or Duw ‘God’, while
in nonfi nal syllables such as tywallt ‘to pour’ yw represents /əu/. The offglide /ɨ/ is vari-
ously spelled u, y and e. The of
fglides /i/ and /u/ are consistently represented by i and w,
and these same symbols are also used for the consonantal glides /j/ and /w/, as in iâr ‘hen’
and wedi ‘after’.
Normal word stress on the penultimate syllable is not marked. Where word stress
is exceptionally on a fi nal syllable this may be shown by means of an accent, either a
circumfl ex accent as in cytûn ‘in agreement’, or an acute accent as in coffáu ‘to commem-
orate’. This does not happen in every case, however, as can be seen from examples such
as ynghyd ‘together’ and paratoi ‘to prepare’. One further accent used is the diaresis, as in
amgaeëdig ‘enclosed’ or glöwr ‘collier’, in order to clarify that this is a sequence of dis-
tinct simple vowels rather than a diphthong. The diaresis always appears on the vowel of
the stressed penultimate syllable.
MORPHOPHONOLOGICAL VARIATION
The most striking type of morphophonological variation in Welsh, as in all the Celtic
languages, is the highly developed system of initial consonant mutation, whereby the
beginning of a word changes according to the lexical or grammatical context in which
it appears. There are also, however, morphophonological rules which give rise to vowel
alternations, and a set of complex alternations affecting a range of monosyllabic gram-
matical items.
Initial mutations
There are three sets of initial consonant mutations, known as the Soft Mutation (SM),
the Nasal Mutation (NM) and the Aspirate Mutation (AM). They emerged naturally, as
a result of normal speech processes, as early as the fi fth and sixth centuries, but have
become fossilized over the years and are now essentially arbitrary. They are shown in
Table 9.3, both in terms of the phonological units involved and orthographically. The Soft
Mutation subsumes a number of varied phonological changes. Voiceless stops shift to the
corresponding voiced stop, with the exception of /g/, which is simply dropped; voiced
stops shift to the most closely related voiced fricatives; /m/ shifts to the most closely
related voiced fricative /v/; /ɬ/ and [r̥] are voiced to /l/ and [r].
The Nasal Mutation affects
only stops. Voiced stops shift to the corresponding nasal; voiceless stops too shift to the
corresponding nasal, though here with an aspirate offglide as in /mh, nh, ŋh/. These ini-
tial clusters are found only as the result of Nasal Mutation, and appear nowhere else. The
Aspirate Mutation affects only voiceless stops, which shift to the most closely related
voiceless fricatives. There is, in addition, a related rule which involves the addition of /h/