To understand this fundamental rite of communion, or, indeed, the essence of any other part of the Christian religion, we must go back to those savage ideas out of which it has evolved. It is easy to account for savage superstitions in connection with blood. The life of the savage being largely spent in warfare, either with animals or his fellow men, the connection between blood and life is strongly impressed upon his mind. He sees, moreover, the child formed from the mother, the flow of whose blood is arrested. Hence the children of one mother are termed "of the same blood." In a state of continual warfare the only safe alliances were with those who recognised the family bond. Those who would be friends must be sharers in the same blood. Hence we find all oyer the savage world rites of blood-covenanting, of drinking together from the same blood, thereby symbolising community of nature. Like eating and drinking together, it was a sign of communion and the substitution of bread and wine for flesh and blood is a sun-worshipping refinement upon more primitive and cannibalistic communion. Dr. Trumbull, in his work on _The Blood Covenant_, has given many instances of shedding blood in celebrating covenants and "blood brotherhood." The idea of substitution is widespread in all early religions. One of the most curious was the sacrament of the natives of Central America, thus noticed by Dr. Trumbull: "Cakes of the maize sprinkled with their own blood, drawn from 'under the girdle,' during the religions worship, were 'distributed and eaten as blessed bread.' Moreover an image of their god, made with certain seeds from the first fruits of their temple gardens, with a certain gum, and with the blood of human sacrifices, were partaken of by them reverently, under the name, 'Food of our Soul.'" Here we have, no doubt, a link between the rude cannibal theory of sacrifice and the Christian doctrine of communion.