(_e_) The first wars, probably, were waged for hunting-grounds; and this may have been a revival, for the carnivorous anthropoid pack, of a state of affairs that existed amongst their ancestors at a much earlier date; for battles for a feeding-ground have been witnessed between troops of the lower Primates. Such a battle between two bands of langur (_Semnopithecus entellus_) has been described;[73] and Darwin relates after Brehm how “in Abyssinia, when baboons of one species (_C. gelada_) descend in troops from the mountains to plunder the fields, they sometimes encounter troops of another species (_C. hamadryas_), and then a fight ensues. The Geladas roll down great stones, which the Hamadryas try to avoid, and then both species, making a great uproar, rush furiously against each other.”[74] As packs of the wolf-ape increased in numbers and spread over the world, they no doubt generally came to regard one another as rivals upon the same footing as the great cats and packs of dogs, and every attempt at expansion or migration provoked a battle. Wars strengthened the internal sympathies and loyalties of the pack or tribe and its external antipathies, and extended the range and influence of the more virile and capable tribes. It is true that neighbouring tribes of savages are not now always mutually hostile. In Australia, we are told, local groups and adjacent tribes are usually friendly;[75] but with them the age of expansion seems to have closed some time ago, and a sort of equilibrium has been established. On the other hand, it is a shallow sort of profundity that insists upon interpreting every war as a struggle for nutrition, an effort to solve the social problem. Aggressiveness and insatiable greed are characteristic of many tribes—passions always easily exploited by their leaders, as in the civilised world by dynasts and demagogues. Plethora is more insolent than poverty. Lust of power, of glory, of mere fighting is a stronger incentive than solicitude for the poor. However, in the development of society nothing has been so influential as war: an immense subject, for the outlines of which I refer to Herbert Spencer’s _Political Institutions_.[76]