Originally published in 1948, this book covers the main papers published on animal colour changes between 1910 and 1943. It is a continuation of the work of van Rynberk and Fuchs, who produced important reviews of the topic in 1906 and 1914 respectively. During the period covered, the topic underwent a considerable growth in interest. This is reflected in a bibliographical list of over 1200 items at the end of the text, over twice the number given by Fuchs for the whole period up to 1914. Containing rigorous analysis and illustrations throughout, this book will be of value to anyone with an interest in chromatophores and the history of science.