Letter from L J [Lawrence Joseph] Henderson, Harvard University, Fatigue Laboratory, Morgan Hall, Soldier's Field, Boston, Massachusetts, to V H [Vernon Herbert] Blackman, 17 Berkeley Place, Wimbledon, London, England More than one thing has conspired to make a visit to England impossible. He thanks Blackman for his kind invitation to dine at the Royal Society Club, and expresses the solidarity that Americans feel for England. 5 June 1940