Points from Foregoing Letters

Abstract

THE results of research on the carbon dioxide content of air under various conditions, carried out immediately prior to his death by Prof. J. S. Haldane, together with Dr. R. H. Makgill, are outlined by Prof. J. B. S. Haldane. The influence of height above ground, vegetation, seasons, soil, sea, city surroundings, etc., is indicated. The simplicity and rapidity of the method devised may render it useful in other fields, for example, for distinguishing, in meteorological observations, between bodies of air of different origin.