Abstract
We live in a time of great biologic discovery, and this is especially true in the field of immunology. The rapidity with which creative thinking is translated into scientific observation in immunology has made it difficult even for workers in the field to keep abreast. A picture is developing of an elegant system of immunologic communication, rivaling the nervous system in complexity and diversification.1 Early studies in immunology were largely concerned with the acute infectious diseases, the great killers of that period. The founding fathers of immunology discovered vaccination and immunization and gave us the concepts of protective immunity and . . .