This work is an introduction to practical phonetics, that is, to the description and clasification of the sounds of speech. The book leads readers to explore the range of human sounds by a series of introspective experiments carried out in their own vocal tracts, proceeding systematically from familiar vocal postures and articulations to new and unknown ones. By actually articulating sounds and attending to the motor sensations thus produced, it aims to give the reader a deeper understanding of the principles of phonetic classification. The book also contains information on recent research, particularly in the aerodynamics and acoustics of speech.