Nearly all of the known dialects are eminently vocalic, and the tongues of the plains, which have been most extensively studied, are notably melodious; thus the leading languages of the group display moderately high phonetic development.
"The Siouan Indians"
W. J. McGee
It has all the vocalic syllables and endings it needs for softness, and incloses them mostly in consonants for condensation, vigor, and emphasis.
"Essays Æsthetical"
George Calvert
The relations of grammar are thus expressed for the most part by changes of vocalic sound, just as in English the plural of "man" is denoted by a change in the vowel.
"Early Israel and the Surrounding Nations"
Archibald Sayce