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The following quotation will, perhaps, best make clear the American biologist's point of view. 'An eminent American biologist in discussing the personality of another distinguished biologist, lately deceased, speaks
of the "maternal genes of industry and unconquerable devotion for his personal mother! It can only be regarded as a pity that he failed to note on a chromosome map the locus of the gene for unconquerable devotion!"'
Constitution and the relation of human form to human nature have led to a vast amount of speculation on types. Pearl's conclusion is that there are no types in the strict sense but only transitions which fit into a normal frequency curve.
This little essay of this great biologist, informed as it is by the spirit of science, by wisdom and love, emphasizes the need for extreme caution in drawing conclusions from statistical data in regard to the inheritance of human character. Mankind may be destroyed by the civilization he has evolved unless "he learns better to comprehend, develop and control his biological nature". There is not much evidence of his wish to do this'.