The skin allograft has been used as the test tool since the beginning of investiga tions of the fate of skin transplanted between two individuals of ordinary genetic diversity. This monograph is designed to furnish the transplantation work er with a review of the significant papers in which skin allografts and xeno grafts, applied to experimental animals and man, have played a role in acquiring a body of knowledge concerning the behavior and fate of these transplants and the reaction of the body to their presence. Skin, an essential organ for survival, a barrier between the "milieu inte...