1. Robert Olby, The Path to the Double Helix (Seattle: University of Washington Press, 1974).
2. Gunther Stent's Molecular Genetics (1st ed., 1971; 2nd ed., written jointly with Richard Calendar, San Francisco: Freeman, 1978) is an outstanding presentation of the fundamentals of the subject, with considerable emphasis on historical aspects. Its aim is to introduce students to the field, whereas Judson is aiming at a more general audience. The two books are very different in character, but no discussion of work in this area would be complete without reference to Stent.
3. E. Chargaff, Heraclitean Fire, (New York: 1978), Rockefeller, I have reviewed the book in Isis, 70, (1979), 276?277.
4. Concerning Avery and his work, see particularly R. Rubos The Professor, the Institute, and DNA (New York: Rockefeller University Press, 1976).
5. See the recent symposium on the history of protein chemistry, Ann. N.Y. Acad. Sci., 325, (1979), 1?373, which contains much illuminating historical material. In the present connection the papers by J. S. Fruton and D. C. Hodgkin are relevant.