S. Porter on the Vowel Elements in Speech, 175 
tered on every pitch with equal purity of tone, and there would 
seem to be one certain key for each, on which the purest tone is 
heard,—the purest musically we mean, that is, the most free 
from discordant intermixture. The same cause above mentioned 
may have an agency in this case also; but I think that here 
the effect may be due primarily to the form and dimensions of 
the vowel-tube. 
7. I would have distinctly understood what I do not, as well 
as what I do, affirm. I do not say that the character of the 
Opposite of the other. But, in each of these modes, the several 
and as the places at which the peculiar quality of each element 
1s most distinctly brought out and sharply discriminated. 
Prof. Henry N. Day, who has given much attention to the subject, seems dis. 
regard the peculiarities of the several vowels as proceedin wholly from 
cause. See his article on Znglish Phonology in the Biblical & y for 
