Rudolph Adolph Acher, The American Journal of Psychology (1910)
“ That this long process of evolution, extending over a great period of time, should have left its stamp upon the soma and psyche of the race and thus upon modern childhood and early youth can hardly be doubted. We thus have at least a tentative explanation of this impulse of the child to strike anything and everything with such satisfaction, and of the youth who is never so happy as when he has a stick or whip in his hand striking real or imaginary objects. ”
