51. Consonants are formed by stopping the breath somewhere in the cavity
of the mouth or by squeezing it through a narrow channel or aperture.
52. SEMIVOWELS. There is no sharp line of demarcation between consonants
and vowels. Some vowels in unsyllabic function (82, 83) notably #i#
(_i̭_) and #u# (_ṷ_) (corresponding to English _y_ and _w_), though
usually classed as consonants, are so closely related to the vowels that
they are termed semivowels (2504). To these may be added also the
liquids #l# and #r#. Contact of the semivowels #i# and #u# with their
corresponding vowels #i# and #u# is avoided in classical times. See for
#-vu-# 107, _c_; for #-quu-# 157; and for #-i̭i-# 104, _c_
(on #obi̭iciō#); 458 (#Bōī# for #*Bōi̭ī#). See 153, 3.
[Erratum:
52 ... See for #-vu-# 107, _c_
107 _c_]