The difference between the two fundamental forms of society, the totemic and the political, is most strikingly evident in the case of their most external characteristic--namely, in the _numbers_ according to which society as a whole, as well as in its parts, is organized and divided. These numbers are the expression of inner motives; hence they form a basis from which we may draw conclusions concerning the latter. In the case of totemic tribal organization, these motives are apparently very simple; natural expansion over a broader territory leads to separation into groups, and this of itself gives rise to the customary division into two, four, and eight parts. How different and more complicated from its very beginnings is the organization of political society! Here also the development proceeds according to law, and yet there is not a constant recurrence of the same motive as is in the case of totemic tribal organization. On the contrary, we find a continuous fluctation between contradictory phenomena, and the frequent appearance of new motives. Early, and still partly legendary, tradition tells us of an organization of society on the basis of the number _twelve_. This mode of organization seems to have emanated from the Babylonians. They were the people who first attempted to govern human affairs in accordance with celestial phenomena. These they observed, not in the unsystematic, imaginative, mythological manner of the natural peoples of Polynesia and America, but with the aid of astronomical instruments. True, the science of the Babylonians was also still based on mythological foundations. These mythological features, however, were combined with the idea of an all-embracing, divine rule of law. The endeavour to find this law and order in the starry sky, the greatest and most sublime sight that the human eye may behold, resulted in observations that were scientific and exact. Thus, the union of the two ideas led with a sort of inner necessity to the acceptance of the number twelve as a norm. The application of this norm to human relations was a direct result of the belief that it was of divine origin. The Babylonian calendar, whose fundamental principles, in spite of numerous reforms, have retained their authority even down to the present, was the first to emphasize the principle of bringing the courses of the sun and moon into an ordered numerical relation for the purpose of reckoning time. Taking as their point of departure the position of the sun at the vernal equinox, and following the movements of the moon until the sun returned to the same position, the Babylonians found that twelve revolutions of the moon were equivalent to one of the sun. While this observation is in reality, of course, only approximately true, to the first astronomers it might have appeared sufficiently exact to be regarded as the law of a divine world order. Thus, the year came to be divided into twelve months; and, since the moon presents four phases in each month, first quarter, full moon, last quarter, and new moon--an observation which long antedates astronomical calculation--the month was at once divided into four parts. Since the month has approximately twenty-eight days, the result was a _week_, comprising _seven days_. This number, therefore, was not, as has sometimes been erroneously assumed, derived from the seven planets. Rather is it true, conversely, that the number of the planets was, with a certain arbitrariness, first fixed at seven after this number, as well as twelve, had come to be regarded as _sacred_, because of its relation to the movements of the sun and moon. These numbers were believed to be written by the gods themselves in flaming letters on the sky. To the Babylonian, the sky furnished a revelation of the laws that should govern terrestrial life. The number twelve, especially, was adopted as the basis of the organization of human society. Of this oldest form of division, however, only meagre and occasional survivals have remained. We may refer to the legendary twelve tribes of pre-exilic Israel--later a source of much difficulty to Talmudic scholars, inasmuch as these tribes are not to be found in history--and also to the twelve gods of Greece, the twelve Apostles, etc. But the number twelve has not merely left its traces in legend; it has also inscribed itself in the records of history. Thus, the Athenian population originally comprised twelve divisions, there being four clans (_phyles_), each of which was composed of three _phratries_. Similarly, the colonial territory of the Greeks in Asia Minor is said to have included twelve Ionic cities.