If the above coeflicients of diffusion be corrected to 16' (corr. 3 per cent. per degree), we get kcop = 1.378 and h0, = 1.607, and it is evident that they agree fairly well with the values or' Stefan and Hufner (cited above). Hagenbach's figures ( I I .37 uncorr.) for the diffusion of oxygen in water must therefore be considered quite incorrect, due to the source of error mentioned ab0L-e. Further, -the ratio between the coefficients of oxygen and carbon dioside, according to the above

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... nts, is I ,166, and this result closely approximates to that calculated for the gases in question from the measurement of the rates of escape of the gases from solution.' Finally, the relation of the results may be considered to be the so-called Exner Rule, accxding to which the rate of diffusion of a gas is inversely proportional to the square root of its density. ~ ~-That is, kOl : kCo2 = d 1 . 5 2 0 2 : d1.1056 = 1 . 1 7 3 . This result closely agrees with the ratio obtained in the above research. EXPERIMENTALFALTET, SWEDEN, NOBEL INSTITUTION PHYSICAL CHEXISTRY IABORATORY