ABSTRACT
In this view there are in human evolution two kinds of hereditary processes going on at once. The two types have been distinguished by the use of two terms originally due to the theoretical biologist and demographer Alfred Lotka.1 The first, genetical type of heredity, which man shares with all other creatures, Lotka calls ‘endosomatic’ or within the body; while the second type, unique to man and which is comprised by culture including material artefacts, he calls ‘exosomatic’ or outside the body.
