Chemical Ecology contains a series of lectures presented in the fall of 1968 at State University of New York College of Forestry at Syracuse University. This book is composed of 11 chapters that deal with the salient facts and theories that are encompassed by chemical ecology and the possible application of fundamental research in this area to pressing problems of ecological importance. After briefly describing the distribution pattern of microorganisms in the soil, this book goes on exploring the coordination and regulation of sexual processes between cells and between individuals in lower and higher plants. These topics are followed by discussions on the aspects of the chemical environment; the diverse associations between insects and their host plants; the self-defense mechanisms of plants against insect predation; and the chemical communication systems within animal species. The subsequent chapters examine the chemical defense and ecology in arthropods and fish. The concluding chapters consider the biochemistry of terpenoid and steroid metabolism and the chemical aspects of juvenile and steroidal molting hormone interactions. This book will be of value to chemical ecologists and researchers and biochemists.