OCUMENT IS THE PROPERTY OF HIS BRITANNIC MAJESTY'S GOVERNMENT). . ECRET. .F.C.(40) 41. 4TH SEPTEMBER, 1940. COPY NO. WAR CABINET. SCIENTIFIC COMMITTEE ON FOOD POLICY. PRODUCTION OF SYNTHETIC VITAMINS IN THE UNITED STATES OF AMERICA. Extract from a letter from Dr. L.F. Fieser to Professor R.P. Linstead of Harvard University. "....In 1939 the United States production of synthetic B1 was in the order of 1500 kg., while in the first two quarters of 1940 it was 500 kg. and 700 kg. respectively. The production is thus expanding fairly rapidly.