Excerpts from Michael Heidelberger's diary during his sabbatical studies in Europe

In this alphabetical journal written during his sabbatical studies in Europe between March to September 1924, Heidelberger described research underway in the laboratories of several prominent scientists he visited, including the biochemist and discoverer of vitamins, Frederick Gowland Hopkins, physiologist, biophysicist, and muscle researcher Archibald Vivian Hill, the immunologist Jules Bordet, the physicist Niels Bohr, and Heidelberger's former mentor, the organic chemist Richard Willstatter. For instance, while visiting St. Mary's Hospital in London, Heidelberger on May 8 attended A. V. Hill's lecture on "Function of Hemoglobin in the Blood," which he considered an "excellent summary of knowledge to date, except that none of our own work [that of Donald D. Van Slyke's laboratory at the Rockefeller Institute] [was] mentioned."