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able already artificial atom atom nucleus attain average basis become behavior biological evolution body brain cell changes characteristics characters chemical combined continue cooperation cord course defective despite direction discoveries earth economic ectogenesis effects embryo emotional energy environment eugenic eugenists eventually existence fact feeble-minded forms further future genes genetic differences germ cell germ plasm greater H. J. MULLER happiness Hence hereditary heredity higher human ical ideals important individual Industrial Revolution inherited intellectual intelligence invention J. B. S. Haldane kind knowledge less living machines mammals man's mankind material matter means mechanism ment mental methods modern multiply mutations natural selection organization persons physical population possible practically present progress protoplasm race realize regard reproduction sense social evolution social inertia society space sperm structure struggle substances tend tion tive traits whole workers