280 THE ROYAL SOCIETY OF CANADA 



Fowle: Astrophysical Jour., 40, 435 (1914), republished in Smith. 

 Mis. Coll., 69, No. 3 (1918) — Avogadro's number and atmos- 

 pheric transparency. For further literature see Fowle's biblio- 

 graphy, paragraph 6 above. 



B. Liquids. 



(a) Measurements of absorption of water in the visible and 

 ultra-violet. 



HiJFNER and Albrecht: Wied. Ann., 42, 10 (1891). 



Ewan: Proc. Roy. Soc, 57, 127 (1894). 



AscHKiNASs: Wied. Ann., 55, 401 (1895). 



Kreusler: Ann. der Phys. (4) 6, 412 (1901). 



AuFSEss: Ann. der Phys., (4) 13, 678 (1904). 



Kayser: Handbuch der Spectroscopic, Vol. 3, 392 — collection of 

 the above data. Ewan's results are here misquoted, the base 

 of the logarithm being confused. This error has been copied 

 in other papers. 



(6) Conclusions regarding scattering based on above absorption 

 measurements. 



Fowle: Smith. Mis. Coll., 69, No. 3 (1918). 

 Raman: Proc. Roy. Soc, lOlA, 64 (1922). 



(c) The relation between light-absorption a^id light-scattering 

 for liquids. 



Martin: Jour. Phys. Chem., 26, 471 (1922). In this paper the con- 

 clusions by Fowle and Raman are criticized, and some new 

 measurements of absorption by dust-free water and benzene are 

 given. 



(d) The colour of water. There is need to distinguish carefully 

 between colour of water by transmitted light — 'which is largely a 

 question of selective absorption — ajid colour of water against a black 

 background, in which case scattering by suspended impurities and 

 molecular scattering are the important factors. See papers under 

 7 (b) above. For reviews of earlier work on colour of water see: 



Lord Rayleigh: Roy. Inst. Proc, Feb., 1910; Nature 83, 48 (1910) ; 

 Collected works. Vol. 5, page 540. 



Bancroft: Jour. Frank. Inst., 187, 249 and 459 (1919), repub- 

 lished in Chem. News, 118, pages 197-200, etc. (1919). 



