Note 259 — Chapter III
Reading edition
Many customs and beliefs of primitive peoples suggest that this correlation of the attributes of blood and shells went much deeper than the similarity of their use in burial ceremonies and for making necklaces and bracelets. The fact that the monthly effusion of blood in women ceased during pregnancy seems to have given rise to the theory, that the new life of the child was actually formed from the blood thus retained. The beliefs that grew up in explanation of the placenta form part of the system of interpretation of these phenomena: for the placenta was regarded as a mass of clotted blood (intimately related to the child which was supposed to be derived from part of the same material) which harboured certain elements of the child's mentality (because blood was the substance of consciousness).