With this and other subtle changes, such as using lactose in place of glucose, they were able to push up yields of penicillin to 20 units per ml. But their cooperation had become one-sided. Heatley noted that ``Moyer had begun not telling me what he was doing.'' Florey returned to Oxford that September, but Heatley stayed on in Peoria until December, then for the next six months he worked at Merck & Co. Inc. in Rahway, New Jersey.
Florey
Heatley