But besides the innate dispositions of human nature determined by heredity and natural selection, which are found in some measure universally, because they are adaptations to conditions that, at one time and not long ago, weighed upon the ancestors of all of us, there are numerous traits (some of them quite superficial) that vary from country to country and from age to age, according to the economic or political type of the society in which a man lives, his place therein, geographical circumstances, religious institutions and the countless causes that govern manners and customs. In the lives of most men these traits are not necessary; they may be adopted and cast aside more than once in an individual’s career: they are temporary _accommodations_ due to education, imitation, tradition; and, in fact, are often the disguises of human nature. Still, as society grows more and more complex, orderly and stable, there is, no doubt, again some natural selection of those individuals who are capable of undergoing the requisite accommodations. Those that cannot endure the restraints of civilisation, wander away; the extremely lazy, improvident, dishonest, or aggressive, in considerable numbers, perish. § 2. THE ORIGINAL STOCK AND THE CONDITIONS OF DIFFERENTIATION To the original mentality of man we can only seek a clue in the higher Primates, and especially in the extant anthropoids. No doubt, during the long millennia that have elapsed since the separation of our own stock from those of other genera and species, they also have undergone some evolution, but probably much less change than we have. Unfortunately, our knowledge of their habits and abilities is still deplorably limited. It seems certain, however, that their intelligence is much greater than that of any other kind of animal. They must have extensive knowledge of their habitat, of all the forest can yield for food or shelter, and of its other denizens dangerous or otherwise. They construct for themselves some sort of sleeping-place, not much inferior to the Australians’ “lean-to,” by piling branches together in the trees. Toward men, anthropoids seem to be unaggressive, and usually retreat from them; but, when attacked, defend themselves with fury. From other animals the male gorilla has nothing to fear, and he defends his family against leopards; the chimpanzee is said to fight leopards with varying success; and, as for the orang, Dyak chiefs told Wallace that no animals dare attack him, except crocodiles and pythons, and that he kills both of them.[29] The food of these apes is chiefly fruit and the tender shoots of trees and bamboos; but they sometimes eat eggs and young birds; and the gorilla is said to eat small mammals: in confinement they all take cooked flesh freely. Socially, they hardly get beyond family life. Orangs male and female are even seen alone, and young ones together without parents; gorillas are seen in family parties; chimpanzees in families, and occasionally three or