360 Dr. W. E. Adeney on the 



illustrated by the formulae given by M. Andresen*, and 

 similar to the formula above (a), viz., for the spectral fraction 

 between the lines F and G blackening silver-chloride paper, 



0-296 P 



W = 47715 x 10 cos<p . 



The sun rays passed through a solution of auramine-O, 

 that is, the spectral fraction situated about the line D, pro- 

 duce an effect on a silver-bromide paper that is sensitized 

 with rhodamine-B, expressed by the formula 



0-109 P 



W = 1663xl0" o^ , 



and the effect of the red rays, which are situated on the 

 other side of «|D (wave-length 610) is measured by a 

 silver-bromide paper sensitized with a solution of chlorophyll, 

 and is expressed by 



_ 0-117 P 



W = 445xl0 cos<p". 



These formulae may also be expanded in a series of in- 

 creasing powers of cos </>, and will then give expressions 

 similar to the formula (b), which may be integrated with 

 regard to t. Those curves giving the distribution of the 

 directly shining sunlight of the less refrangible spectral 

 regions will be of the same nature as the one we have found 

 for the more refrangible light, but they will not be equi- 

 distant, and their special points vs ill probably not all correspond 

 to the same latitudes. 



Chemical Laboratory, 



Royal Norwegian Agricultural College, 



Aas, near Kristiania. 



XXXIV. Unrecognized Factors in the Transmission of Gases 

 through Water. By W. E. Adeney, D.Sc, Curator and 

 Examiner in Chemistry in the Royal University, Dublin f. 



THE question of the possibility of atmospheric gases being 

 transmitted through water by any process other than 

 that of diffusion, or by thermal currents, or mixing, does not 

 appear to have been considered. 



Hiifner J found, in his work on the diffusion coefficients 

 of gases in water, that, if a gas be placed above the liquid, 

 the phenomenon of diffusion is disturbed by downward 



* Eder's Jahrbucli fur Photographie etc. siii. 1899, p. 149. 

 t Communicated bj^ the Author. (Reprinted from Trans. Roy. Dubl. 

 Soc. : read Dec. 20, 1904.) 



I Ann. Phys. Chem. (11) vol. lx. pp. 134-168 (1897). 



