Walther Birkmayer, one of the co-discoverers of the neuro chemical causes of Parkinson's disease and of its treatment by neurotransmitter-replacement therapy, and his former col laborator and colleague Peter Riederer have succeeded in this book in giving us an outline and overview of current knowl edge of the biochemistry of the brain and synaptic transmis sion between nerve cells, together with an appreciation of how these factors relate to recent findings in human behavioural science, an area in which both authors have made substantial contributions. Ethology is the systematic study of...