George Warburton, The Conquest of Canada, Vol. 2
“ The scalping is an operation not calculated of itself to take life, as it only removes the skin, without injuring the bone of the head, and necessarily, to be a genuine scalp, must contain and show the crown and center of the head—that part of the skin which lies directly over what the phrenologists call 'self-esteem,' where the hair divides and radiates from the center, of which they all profess to be strict judges, and able to decide whether an effort has been made to produce two or more scalps from one head. ”
