Since 1915, Dr. J. M. Rogoff has collaborated with me in all the work on the adrenal glands. It has been a joint research, and even when I speak in the first person singular I include him. Further, the investigation, although extending over a long time, was planned as one continuous piece of work on the two glands constituting the adrenal bodies. As it was planned, so it was carried out, with few modifications. The work on the interrenal gland overlapped that on the chromaffin tissue, but when the latter had been proved to possess only slight physiologic significance, or, at any rate, not to be concerned essentially in the preservation of health and life, we decided to spend no further time on the medulla but to concentrate all our efforts on the cortex. Many interesting facts, however, were discovered in regard to the liberation of epinephrine from the medulla,