The mediae have become aspirate tenues with a low intonation, which also marks the words having a simple initial consonant; while the former aspirates and the complex initials simplified in speech are uttered with a high tone, or, as the Tibetans say, " with a woman's voice," shrill and rapidly.
The Phoenician alphabet possessed many more aspirates than were required in Greek, which tended more and more to drop all its aspirates.
It therefore made the aspirates A, E, Q and the semi-vowel I into vowels, and apparently converted the semi-vowel Y = w into the vowel which it placed at the end of the alphabet and substituted for it as the sixth symbol of the alphabet the letter F with the old value of w.
The Greek aspirates were not the sounds which we represent by ph, th, ch (Scotch), but corresponded rather to the sound of the final consonants in such words as lip, bit, lick, the breath being audible after the formation of the consonant.
The differentiation of the Roman alphabet from the Greek is brought about (a) by utilizing the digamma for the unvoiced labio dental spirant F; (b) by dropping out the aspirates 0, (I), in the Chalcidian alphabet, whence the Roman is derived) from the alphabet proper and employing them on l as numerals, 0 'y' ?
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