But even if the brain were divided into compartments, each resting against the skull, it would next be necessary for the phrenologist to prove that quantity means quality or that quantity means power. Otherwise, a person might have a large quantity of, say, combativeness, and a small quantity of, say, veneration, as donated by the size of the bumps, at the places where those faculties are supposed to reside, but the brain matter in the veneration compartment might be twice as dense, compact, active, powerful or flexible as the brain matter in the combativeness compartment, and hence the phrenologist would be deceived by outward appearances. The phrenologist must depend upon size, and he must assume that every part of the brain is of the same density, texture and power. For example, when he sees a head that is large and full in the upper forehead and small at the back, he at once declares that that person's casuality, eventuality and comparison, are highly developed, and that his amativeness and philoprogenitiveness are poorly developed. Size is the measure, and he assumes that size means volume, and that volume means power. Hence, a man with a large head must have more brains than a man with a small head, and the more brains he has, the greater his power, other things being equal. He forgets that many idiots have enormous heads, and that the heads of many of the world's greatest characters were very small. Several kinds of monkeys, the dolphin, the canary and the sparrow, all have larger brains than man, in proportion to the size of the body. The ground mole and field mouse have about the same proportion as man. The whale, the rat, the porpoise and the goose have more. Again, the researches of physiologists of the highest authority seem to have established the fact that the brain acquires its full size and weight at the age of eight years! How can the phrenologist reconcile his philosophy to this stubborn fact? The skull and head continue to grow after the age of eight, but the brain remains the same in weight and size. Everybody knows how the skulls of children change as they grow up, and yet the brains never do. As the child acquires knowledge and develops his mental faculties, the brain remains the same size and weight. What then have bumps to do with his mind? We may polish our brains, but we cannot add to them. And so, when the phrenologist says that this pulpy matter called brains gradually grows larger and crowds the skull bones out so as to make bumps, or that it shrinks, for want of exercise, and makes the skull contract with it, causing indentations, he is not talking from facts but from a premise founded on a delusion.