This is a well conceived and executed volume detailing in close to encyclopedic proportions the question of control of air borne contamination in hospital environments. Many different ap plication areas are described and well documented. Alternative solutions are presented in historical perspective with the neces sary scientific background to provide the uninitiated an oppor tunity to learn not only how to solve a particular problem but more critically why one solution is preferable to another. Every clinician concerned for his patients' welfare must consider the quality of the environment...