The title of the address at the University of Virginia had a ring of scientific heresy: "Heritance of Acquired Characteristics." Yet the speaker was an eminent researcher. Dr. Frank L. Horsfall Jr., director of Manhattan's Sloan-Kettering Institute. What he did, pulling together recent research from a number of laboratories, was to show that:
> Heredity can, at least in the somewhat limited field of bacteria, be changed and even directed.
> Control of heredity in cells could be a key tool in preventing cancer.
Charles Darwin propounded the doctrine that evolution occurs by natural selection, in which some individuals happen, by chance combination...