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66 they returned at last to the week again, and called its seven days by the names of the sun, the moon and the five planets. However, the division of the month into three decads is not always connected with solar chronology; it is also found in combination with lunar reckoning, when three phases of the moon are acknowledged (as in the three-headed forms of the moon in the Greek mythology).

A five-days ' period has been proved to exist in many nations as the equivalent of our week (among the Chinese, Mongol tribes, Azteks, and Mexicans.) But this division into pentads must be connected with an original quinary system of numeration, to the linguistic importance of which Pott has devoted a special treatise. In Old Calabar on the west coast of Africa a week of eight days occurs; most curiously, as the people cannot count beyond five. A priori this would seem impossible; but it is vouched for by an observer so accurate as Bastian.

§3. As the Nomadic stage of civilisation of necessity historically precedes the Agricultural, so also that stage of the myths at which the nocturnal, dark or cloudy heaven has precedence of the bright heaven of day comes before the stage at which the latter occupies the foreground and plays the part of a beloved figure or favourite. Moreover, it cannot be assumed that this second stage of the formation of myths has grown up without being preceded by the first stage; for it is simply impossible that any portion of mankind should have lived through the stage of Nomadism, which perhaps lasted for thousands of years, without having thrown its conceptions of the world into mythic forms. Everyone knows, and no one now doubts, that the most prominent figure in the mythology of