The chief atmospheric phenomena were also personified; of this we may give one example. All travellers in Chaldaea agree in their descriptions of those sudden storms which burst on the country from a clear sky, especially towards the commencement of summer. Without a single premonitory symptom, a huge, black water-spout advances from some point on the horizon, its flanks shooting lightnings and thunder. In a few minutes it reaches the traveller and wraps him in its black vapours; the sand-laden wind blinds him, the rain pours upon him in solid sheets; but he has hardly realized his position before the storm is past and the sun is again shining in the blue depths above. But for torn and overthrown tents and trees uprooted or struck by the electric fluid, a stranger to the country might almost believe himself to have been the sport of a dream.[106] [Illustration: FIG. 11.--Assyrian Cylinder, in the National Library, Paris. Jasper.] [Illustration: FIG. 12.--Assyrian Cylinder, in the National Library, Paris. Serpentine.] The force and suddenness of these visitations could hardly fail to impress the imagination of a people exposed to them, and it is not surprising that Mesopotamia had its god of storms and thunder. He, Raman, it is, perhaps, who is figured in the bas-relief from Nimroud reproduced below (Figs. 13 and 14),[107] in which a god appears bearing an axe in his right hand, and, in his left, a kind of faggot, whose significance might have escaped us but for the light thrown upon it by classic sculpture. The latter no doubt borrowed a well-known form from the east, and the object in question is nothing less than the thunderbolt given by Greek artists to their Zeus. [Illustration: FIG. 13.--Gods carried in procession; from Layard's _Monuments of Nineveh_, first series, pl. 65.] It was this adoration of the stars and planets that led by degrees to what we call polytheism. Man partitioned those terrible powers of nature of which he felt himself the sport, between a vast number of agents, between crowds of genii upon whose mercies he thought himself dependent, and whom he did his best to propitiate by gifts and to compel by magic. Little by little, intelligence perfected that work of abstraction and simplification by which all races but those who have stuck fast in the conceptions of their infancy have arrived at a single conclusion. Without ceasing to believe in the existence of genii, they invented the gods, a race of beings far more powerful, not only than short-lived man, but even than the confused army of demons, of those beings who enjoyed the control of not a few of the mysterious agencies whose apparent conflict and final accord are the causes of the life, movement, and equilibrium of the world. [Illustration: FIG. 14.--Gods carried in procession; from Layard's _Monuments of Nineveh_, first series, pl. 65.]