to purchase. It lists the various instruments and gives the prices which by now may be somewhat outdated but will give the reader an idea of the comparative values. The chapter entitled "Physics of Sound" is a little too short to give a satisfactory and understandable explanation of the complicated and extensive subject. The other chapters will guide the industrial hygienist through the field of sound measurement technic, sound survey, calibration, effects of noise, engineering control to medical aspects of hearing conservation to personal protection in noise control. Any person with scientific training wvho is concerned with the noise problem and is not yet an expert in the field will find this book of great value. JAN LIEBEN