In describing the kinds of animals used in scientific experiments and the ways in which they benefit man, Mrs. Hyde imparts a specific point of view designed to dissuade budding anti-vivisectionists. No animal sacrifice is in vain. The knowledge it brings to science may some day not only help a human being but a human's pet as well! And not all experiments demand the life of the subject. There are pigeons who have been used in the development of teaching machines, chimps who rank with astronauts in space pioneering, goats used in experiments on mother love, rats who demonstrate new learning theories. The squeamish might avoid the last chapter dealing with at-home experiments on growing two headed planaria, breeding flies, etc. In general, Mrs. Hyde goes about proving how animals have contributed immeasurably to the conquest of disease, the development of drugs and the continued welfare of society.