By the author of Wings in Your Future (with Maurice Ames, 1955), here is an efficient and arresting working summary of how the human sees, hears, feels, smells, tastes and reacts to the total surroundings. Beginning with the eye, Mr. Schneider first explains some of the basic ways in which light acts. With this reference, in turn strengthened by examples of simple experiments one can do at home (such as casting an image with a magnifying glass), the functions of the eye and its parts become quite clear. So it is with the ear, skin surface, nose and tongue. With a concentration on the how rather than the why, there will be questions from youngsters who want fuller explanations, but the total picture of the human nervous system and its brain center is a valuable factual tool.