Among the sounds of the Simian voice I have not found the English vowels "a," "i," or "o," except, perhaps, "i" short as sounded in the word "it." The vowel "u," as sounded like "oo" in "shoot," seems to be the chief sound of their speech. One important point which I discovered from the phonograph is, that sounds or tones which are purely musical are reproduced alike with the cylinder turning either way, while all speech sounds are slightly changed when the cylinder is reversed, which shows the sounds to be compound. I find that "w" may be developed from any consonant by manipulating the cylinder of the phonograph, and it is a fact also that the initial consonant imparted to any vowel does not continue through the vowel. This I have shown by making a vowel sound which I prolong for some seconds with the cylinder revolving at a given rate of speed. While reproducing this at a normal speed I intercepted at any point, and developed the sound "w" as heard in "woe." The instant I have blended this into the vowel, I lift the diaphragm until the normal speed is restored, when I replace the reproducing tooth showing the sound without the consonant. In like manner I dictate to the phonograph any vowel sound preceded by a consonant. The consonant I utter in a natural way, the vowel I prolong for some seconds, and in the act of reproducing this I cut the sound in two and find the vowel element is not modified by the consonant which preceded it, hence, I observe that the consonant merely suggests to the mind a certain form of sound which does not change the fundamental vowel. In fact, it aids the voice somewhat in uttering the vowel. If human speech were composed of none but vowel sounds the human voice could scarcely utter them in a continued conversation; their monotony would not so much offend the ear as it would try the vocal powers, and man would soon acquire consonants to aid the voice if for no other use. [Sidenote: DOUBLE AND TREBLE CONSONANTS]