ness: Manual Superiority and Cerebral Domi- Responses of Psychological and Physiological Functions to Environmental Light—Parti.

In this first of a two part series, Dr. Ott gives us a historical overview of light re-search and its effect on plant and animal life. This research has a direct physiologico-anatomical bearing on human activity. Next month Dr. Ott will detail some of the rather amazing data received as a result of some of the current laboratory research.—C.C.E. Modern civilization is bringing about an ever faster and faster change in one of man's most important environments—light. Since the beginning of time life on this earth has evolved under natural sunlight. But to-day we are suddenly and drastically upset-ting this natural light environment. We are walling ourselves in behind glass that filters out some of the important rays of the sun and using artificial light sources that are grossly distorted from the natural balance of all the wavelengths of sunlight energy. The benefits of sunlight on the skin, synthesizing vitamin D, are well known. However, we are just beginning to find that light entering the eyes, in addition to vision, stimulates activity in both the pituitary an