Another myth which has affinities with the tale of Tammuz and Ishtar is the Egyptian one which deals with the quest of Isis. The god Osiris is slain through the machinations of his brother Set (who, being identified elsewhere with a black hog, recalls the boar which slew Adonis and Attis), and his body, enclosed in a chest, is cast into the Nile. Afterwards the chest is thrown up by the waves, and round it springs miraculously a tamarisk tree. Meanwhile Isis, wife and sister to Osiris, travels hither and thither in search of his remains, which in due time she finds. However, the chest is stolen from her by Set, who, taking therefrom the body of Osiris, tears the corpse into fourteen pieces, which he scatters broadcast through the land. Isis still pursues her quest, till she has found all the portions and buried them. These tales were the mythical correlates of certain ritualistic practices designed to bring about the change of seasons, and other natural phenomena, by means of sympathetic magic. The burden of a great duty falls upon the shoulders of primitive man; with his rites and spells and magic arts he must assist the universe in its course. His esoteric plays, typifying the mysterious fact of growth, are necessary to ensure the sprouting of the corn; his charms and incantations are essential even for the rising of the sun; lacking the guarantee of science that one season shall follow another in its proper order, he goes through an elaborate performance symbolizing the decay and revival of vegetation, believing that only thus can the natural order be maintained. Through the force of sympathetic magic he sees his puny efforts related to the mighty results which follow them.