Book excerpt: From the 1930's to the 1970's, Harry Harlow's experimental findings have changed the way psychologists view learning, thinking, and motivation. The papers selected for From Learning to Love study behavior principles and describe better techniques for examining them. They discuss in depth the development of learning, motivation, and the affectional system as well as the interrelationships between love, aggression, and fear. A comprehensive collection, From Learning to Love is a valuable resource for psychiatrists, child care specialists, and parents who want to understand how their children develop.