It is hazardous for man to depend on his logic regarding biological principles before he measures.
Human logic is often in error pertaining to the growth of the jaws.
Since the advent of cephalometrics we have no excuse for such errors. Before the cephalometric radiogram we could be excused for errors in judgment regarding craniofacial growth. Many examples of such errors, diametrically opposite to the facts, can be pointed out in the literature of the past. Precedence can be cited for investigators in our past who knew the value of measuring, first. Dr, John Hunter, in England, studied the growth of the jaws in animals by using metal implants.