Advocates of vegetarianism may, of course, challenge this statement and show that all the testimony of anthropology is not in favor of the meat-eaters. It must also be admitted that diet is not the only essential factor in environment which influences the development of races. And there is no conclusive evidence to prove the absolute superiority of one diet over another. Neither have we any proofs that cannibalism ever was in general practice. It rather seems to have been confined to limited groups of people in especially ill-favored localities or to times of great scarcity of food. Hence we can neither refer to cannibalism as a typical stage in human history, nor are we obliged to accept the vegetarian hypothesis of a transition from a meat diet to a plant diet as a condition sine qua non of higher human development. CHAPTER II. THE FAMILY. Morgan, who spent the greater part of his life among the Iroquois in the State of New York and who had been adopted into one of their tribes, the Senecas, found among them a system of relationship that was in contradiction with their actual family relations. Among them existed what Morgan terms the syndyasmian or pairing family, a monogamous state easily dissolved by either side. The offspring of such a couple was identified and acknowledged by all the world. There could be no doubt to whom to apply the terms father, mother, son, daughter, brother, sister. But the actual use of these words was not in keeping with their fundamental meaning. For the Iroquois addresses as sons and daughters not only his own children, but also those of his brothers; and he is called father by all of them. But the children of his sisters he calls nephews and nieces, and they call him uncle. Vice versa, an Iroquois woman calls her own children as well as those of her sisters sons and daughters and is addressed as mother by them. But the children of her brothers are called nephews and nieces, and they call her aunt. In the same way, the children of brothers call one another brothers and sisters, and so do the children of sisters. But the children of a sister call those of her brother cousins, and vice versa. And these are not simply meaningless terms, but expressions of actually existing conceptions of proximity and remoteness, equality or inequality of consanguinity. These conceptions serve as the fundament of a perfectly elaborated system of relationship, capable of expressing several hundred different relations of a single individual. More still, this system is not only fully accepted by all American Indians--no exception has been found so far--but it is also in use with hardly any modifications among the original inhabitants of India, among the Dravidian tribes of the Dekan and the Gaura tribes of Hindostan.