This list of towns has another peculiarity which arrests the attention. It apparently comprises all the towns of the League, but these are divided among only three clans, those of the Wolf, the Tortoise and the Bear. The other clans of the confederacy are not once named in the book. Yet there are indications which show that when the list of chiefs which concludes the book was written, at a date long after this list of towns was first recited, other clans existed in three of the nations. This is an important point, which merits further consideration. Those who have read the admirable account of the "League of the Iroquois," by Morgan, and his philosophic work on "Ancient Society," are aware that he has brought out and elucidated with much clearness and force the nature and results of the remarkable clan system which prevails among the North American Indians. It is not universal, as it does not seem to be known among the widely scattered bands of the Crees and the Athapascans, or among the Indians of Oregon. [Footnote: See _Ancient Society_, pp. 167, 175, 177.] It was found, however, among the great majority of tribes in the region north of Mexico and east of the Rocky Mountains, and was sufficiently alike in all to indicate a common origin. Mr. Morgan finds this origin in a kinship, real or supposed, among the members of each clan. He considers the clan, or gens, and not the single family, to be the natural unit of primitive society. It is, in his view, a stage through which the human race passes in its progress from the savage state to civilization. It is difficult, however, to reconcile this theory with the fact that among some races, as for example, the Polynesian and Feejeean, which are in precisely the same stage of social advancement as the North American Indians, this institution is unknown; and even among the Indians, as has been said, it is not everywhere found. There are many indications which seem to show that the system is merely an artificial arrangement, instituted for social convenience. It is natural, in the sense that the desire for association is natural to man. The sentiment is one which manifests itself alike in all stages of society. The guilds of the middle ages, the masonic and other secret brotherhoods, religious organizations, trade unions, clubs, and even political parties, are all manifestations of this associative instinct. The Indian clan was simply a brotherhood, an aggregate of persons united by a common tie, sometimes of origin, sometimes merely of locality. These brotherhoods were not permanent, but were constantly undergoing changes, forming, dividing, coalescing, vanishing. The names of many of them show their recent origin. The Chicasas have a "Spanish clan." [Footnote: _Ancient Society_, p. 163.] The Shawnees had a "Horse clan." [Footnote: Ibid, p. 168.] The Iroquois, of Eastern Canada, made up of fragments of all the Five Nations, had an "Onondaga clan," and an