There has been considerable comment on some of the specific findings of medical experiments in the recent Gemini programs, but little recognition of the complex problems involved in performing such experiments during the course of an exacting space mission. When we consider that, in the recent 14-day mission, two astronauts lived for a fortnight in a space somewhat less than the front-seat area of a small foreign automobile, it is obvious that the success of most of the experiments depended to a considerable degree on the forbearance and cooperation of the astronauts themselves.
They were equipped with a selection of ingenious sensors to perform measurements including blood pressure determination, phonocardiogram, pulse rate, and electroencephalogram. In addition, calcium and nitrogen balance experiments were carried out, requiring collection of urine and feces not only for a period prior to and following the mission, but during the space mission itself. Little imagination is