The mechanism of speech is a very complex one and in order to undertake any analysis of language it is important to understand the processes that go to make up the message that a speaker transmits and a listener receives. Professor Fry therefore first takes the reader through the various stages of the speech chain: from language units to nerve impulses to muscle movements to sound waves, and vice versa as the message is received and decoded. He then explains the basic physical principles involved in the generation and propagation of sound energy and in the phenomenon of resonance. These...