The aim of this work is wider than its title would lead the spectator to expect. It attempts to suggest the possibility of a historical, or rather prehistorical, evolutionist derivation of all crimes of violence, from the individual attack on life known as murder or manslaughter to the collective organized killing which we call war. The author has tried to show that the mute witness of the fossil archaeological remains of prehistory the period before articulated human thought found the means of permanent expression in word and writing can be made intelligible on the basis of Jung's theory of archetypal ideas surviving in the ancestral subconscious strata of the human mind and revealing themselves all over the world in the legends, myths and rites of historic man as well as in the fleeting dreams and lasting delusions of contemporary humanity.