Originally published in 1928 as part of the Cambridge Psychological Library, this book argues that the divide between psychology and physiology is largely artificial, and that each discipline can contribute to further understanding of the other. MacCurdy applies conclusions drawn from behavioural psychology to physiological phenomena, and discusses phenomena of the nervous system in an attempt to create a vocabulary 'in which all the phenomena of living matter can be discussed'. This book will be of value to anyone with an interest in the overlap of psychology and the more physical sciences.