Distinctive features occur in lumps or bundles, each one of which we call a phoneme. The speaker has been trained to make sound-producing movements in such a way that the phoneme-features will be present in the sound-waves, and he has been trained to respond only to these features and to ignore the rest of the gross acoustic mass that reaches his ears. Leonard Bloomfield (1933)
The number of different phonemes in a language is a small submultiple of the number of forms. Leonard Bloomfield (1926)
The logical demand that a science speak in quantitative terms is met by linguistics because it speaks in terms of phonemes. Leonard Bloomfield (1927)