Such views were difficult of acceptance by a thoughtful people, once they appreciated the fact of the disintegration of the corpse in the grave; and in course of time it was regarded as essential for continued existence that the body should be preserved. The idea developed, that so long as the body of the deceased was preserved and there were restored to it all the elements of vitality which it had lost at death, the continuance of existence was theoretically possible and worthy of acceptance as an article of faith.
Let us consider for a moment what were considered to be elements of vitality by the earliest members of our species.[251]
From the remotest times man seems to have been aware of the fact that he could kill animals or his fellow men by means of certain physical injuries. He associated these results with the effusion of blood. The loss of blood could cause unconsciousness and death. Blood, therefore, must be the vehicle of consciousness and life, the material whose escape from the body could bring life to an end.[252]
The first pictures painted by man, with which we are at present acquainted, are found upon the walls and roofs of certain caves in Southern France and Spain. They were the work of the earliest known representatives of our own species, Homo sapiens, in the phase of culture now distinguished by the name "Aurignacian".
The animals man was in the habit of hunting for food are depicted.[253] In some of them arrows are shown implanted in the animal's flank near the region of the heart; and in others the heart itself is represented.
This implies that at this distant time in the history of our species, it was already realized how vital a spot in the animal's anatomy the heart was. But even long before man began to speculate about the functions of the heart, he must have learned to associate the loss of blood on the part of man or animals with death, and to regard the pouring out of blood as the escape of its vitality. Many factors must have contributed to the new advance in physiology which made the heart the centre or the chief habitation of vitality, volition, feeling, and knowledge.
Not merely the empirical fact, acquired by experience in hunting, of the peculiarly vulnerable nature of the heart, but perhaps also the knowledge that the heart contained life-giving blood, helped in developing the ideas about its functions as the bestower of life and consciousness.
The palpitation of the heart after severe exertion or under the influence of intense emotion would impress the early physiologist with the relationship of the heart to the feelings, and afford confirmation of his earlier ideas of its functions.
But whatever the explanation, it is known from the folk-lore of even the most unsophisticated peoples that the heart was originally regarded as the seat of life, feeling, volition, and knowledge, and that the blood was the life-stream. The Aurignacian pictures in the caves of Western Europe suggest that these beliefs were extremely ancient.
The evidence at our disposal seems to indicate that not only were such ideas of physiology current in Aurignacian times, but also certain cultural applications of them had been inaugurated even then. The remarkable method of blood-letting by chopping off part of a finger seems to have been practised even in Aurignacian times.[254]