This is chiefly observed in the case of the peritoneum, where the implication of the serous coat of the stomach or of the great omentum is sometimes followed by the development of cancer in the lower abdomen. In such cases it is probable that small clumps of cancer cells become detached, and, being aided by the force of gravity, fall like seed into one of the pelvic pouches and subsequently develop. Transplantation upon mucous membranes is not infrequently observed in cases of cancer of the stomach secondary to disease of the oesophagus or the mouth (p. 26).

E. Contact Infection

This has already been described in the chapter upon Morbid Anatomy (p. 23).