Cora May Williams, A Review of the Systems of Ethics Founded on the Theory of Evolution
“ As we have seen, a connection of use, or of duration and intensity of function, with its strength is evident in the individual, and we are compelled to suppose the connection a constant one even where such constancy cannot be directly demonstrated. There is evidently a relation likewise between degree, or duration and intensity, of use or exercise of function, and strength of tendency in the species, which we must also suppose to be constant. ”
