Nov. 19, 1919.
The Medical Research Committee
The fifth annual report of the Medical Research Committee (a body appointed under the national health insurance act to undertake research) has issued its fifth annual report. This surveys the advances in medical science during the war, and indicates how they may be utilized in peace. Some very interesting researches are described. One is that of Dr. Benjamin Moore on "photosynthesis." He finds that in the presence of sunlight, but without the aid of bacteria, both fresh water and marine algae are able to take nitrogen out of the air and to "fix" it. The nitrogen is taken up probably as nitrites and nitrates formed by the action of light on nitrogen and oxygen in the air or dissolved in water. Evidence has been found that the so-called "active oxygen" of fresh country air is not ozone, but nitrogen peroxid, probably formed by