Physiological effects of high pressures of nitrogen and oxygen.

A brief survey is giveen of the effects of different pressures on living organisms. Highoxygen partial pressures inhibit oxidative metabolism and, according to Gersehman, have effects which summate at some point with the effects of radiation. In a study of the mechanism of the narcotic effect of inert gases, it was found that high pressures of nitrogen and argon, but not helium, act like other anestheties in favoring water-in-oil rather than oil-inwater emulsion of dilute NaOH solutions and olive oil. The effect is small but appears to be real. This suggests that inert gases may make the lipoidal surface layer of cells relatively