The human speech sounds, tracing the evolution of the forty-three speech sounds in the human voice through all their series, classes, kinds and forms to the limit of audible distinction; describing their organic formations; together with the positions of the mouth parts and establishing and exemplifying the physiologically correct pronunciation of all their ninety-three different forms; also giving thoroughgoing inflection and articulating exercises, rules for audible syllabication and the logical notation of the sounds
Luthy, Charles T