(M1) The spectacle of the great changes which annually pass over the face of the earth has powerfully impressed the minds of men in all ages, and stirred them to meditate on the causes of transformations so vast and wonderful. Their curiosity has not been purely disinterested; for even the savage cannot fail to perceive how intimately his own life is bound up with the life of nature, and how the same processes which freeze the stream and strip the earth of vegetation menace him with extinction. At a certain stage of development men seem to have imagined that the means of averting the threatened calamity were in their own hands, and that they could hasten or retard the flight of the seasons by magic art. Accordingly they performed ceremonies and recited spells to make the rain to fall, the sun to shine, animals to multiply, and the fruits of the earth to grow. In course of time the slow advance of knowledge, which has dispelled so many cherished illusions, convinced at least the more thoughtful portion of mankind that the alternations of summer and winter, of spring and autumn, were not merely the result of their own magical rites, but that some deeper cause, some mightier power, was at work behind the shifting scenes of nature. They now pictured to themselves the growth and decay of vegetation, the birth and death of living creatures, as effects of the waxing or waning strength of divine beings, of gods and goddesses, who were born and died, who married and begot children, on the pattern of human life.