From a historical outline of transplants to the concept of biological ego.

A chronology of the biological preliminaries of human transplantation science is proposed together with a chronological listing of the applications which transplants have had in clinical medicine in general and in pediatrics in particular. The most significantly immunological elements which surface from this assortment of experiences (in which those of pediatric interest have a considerable role) contribute easily to a more deeply perceived culture of man's biological individuality.