Edward William Brabrook,
The Zoologist
(1897)
“ How long it took Man to make the discovery and acquire the art, who can say? Even now, the human mind works slowly. May it not have worked even more slowly in that time of Man's infancy? It seems not unreasonable to conclude that this great discovery may have come upon him by degrees, and that the first step in it—the ascertaining that a stone with a sharp edge was more effective than a smooth one, and that such a sharp edge might be produced by smartly knocking one stone against another—would give rise to a rude and simple implement, to which a single knock had given all the effect desired. ”
