learned to do routinely—and proceeded with confidence and vigor, he would have succeeded in this final project.

Bob Corey's place in scientific history is clear; he was a central figure in the birth of the field of molecular biology. Linus Pauling has often been called the father of this field, but Bob's role was crucial. As Pauling's close associate he carried out many of the key experiments needed to confirm Pauling's theories; and he carried out these experiments with such care and thought that the results could not be doubted. He preferred to remain out of the lime-light, but his presence could always be felt in the precision of the way in which Pauling's ideas were formulated and in the care with which they were presented. The molecular models that he designed are a tangible legacy; his concept of scientific progress—careful experimentation with loving attention to detail—is a less tangible but not less important legacy. He was, as Pauling said, ''a good man, a sincere man, a man with a deep interest in the physical and biological world, a man who found happiness in scientific research."

This biographical memoir was originally commissioned to Linus Pauling and E. W. Hughes, but was not completed. I am indebted to Ruth Hughes, Eddie's widow, for material he had collected; to the Caltech archives for letters, references, and the photograph of Corey; and to Ramesh Krishnamurthy, project director for the Ava Helen and Linus Pauling papers at Oregon State University, for early correspondence between Corey and Pauling. I am also indebted to Verner Schomaker for many helpful comments, ideas, and remembrances.