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The phenomena of the hereditary mneme show clearly how ontogeny is the result of engraphia combined with selection, in the series of ancestors.

The sexual repulsion which normally exists between animals of different species rests on a selective basis, the hereditary mneme of their reciprocal germs being unable to place itself in homophony, and their blood also having a mutual toxic action.

In his book on "The Mneme," Semon explains the infecundity of hybrids in a very plausible manner, by the disorder that a too large quantity of dissimilar hereditary engrams causes in the hereditary mneme of two conjugated cells.

The Mneme.—The secret of heredity lies in the phenomena which have been just described.

The sum of the hereditary and individual engrams thus produced in a living organism is designated by the term mneme.