In this paper the author enunciates and illustrates the following propositions:—Speech is produced by distinctly separate jets of breath emitted under pressure; each such jet he names a monopressure. A monopressure may be used for the utterance of a single syllable, which may consist of a single vowel, or a vowel preceded or followed, or both, by consonants. In a monopressure the sound is weaker at the beginning and end, and stronger in the middle. The weak beginning, or the weak ending, of a monopressure, or both, may be used for the utterance of an unaccented syllable. There are thus four forms of a monopressure:—monosyllabic; dissyllabic, with the accent on the first; dissyllabic with the accent on the second; trissyllabic, with the accent on the second.