"I shall draw the conclusions... 1st, that the fiercer animals are, the less brain they have; 2d, that this organ seems to increase in size in proportion to the gentleness of the animal; 3d, that nature seems here eternally to impose a singular condition, that the more one gains in intelligence the more one loses in instinct. Does this bring gain or loss? Do not think, however, that I wish to infer by that, that the size alone of the brain, is enough to indicate the degree of tameness in animals..."