[MILLER] CHEMICAL LABORATORY RESEARCHES 279 



cence of ethylene has been measured at various temperatures 

 above the critical temperature and for various wave-lengths of 

 light. The results are in good accord with the Smoluchowski 

 theory. 



Andant: Comptes rendus, 174, 1333 and 1541 (1922). 



B. Theories of critical opalescence. 



KoNOWALOW: Ann. der Phys., 10, 360 (1903). 



Donnan: Chem. News, 90, 139 (1904). 



Smoluchowski: Ann. der Phys., 25, 205 (1908). 



Keesom: Ibid., 35, 591 (1911). 



Einstein: Ibid., 33, 1275 (1910). 



Ornstein: Amst. Proc, 15, 54 (1912); 17, 793 (1914). 



5. LIGHT-SCATTERING BY COLLOIDS. 



Much work on light-scattering of both theoretical and experi- 

 mental nature is to be found in the literature of colloidal chemistry. 

 Rayleigh's theory has been much elaborated by Mie, Havelock, Gar- 

 net, Gans, Svedberg, Lorenz, Lorentz, J. J. Thomson and many 

 others. Much experimental work has been done on both conducting 

 and non-conducting particles of various sizes. For bibliography see: 

 Burton: Physical properties of colloidal solutions — 'Longmans. 



Green (1921), pages 120-121. 



6. THE BLUE COLOUR OF THE SKY and other meteorological 



and astronomical phenomena. 



For bibliography see Fowle: Jour. Opt. Soc. Amer., 6, 105 (1922). 



7. LIGHT ABSORPTION IN RELATION TO LIGHT-SCAT- 



TERING. 



A. Gases. 



King: Phil. Trans., 212A, 375 (1913), abstracted in Proc. Roy. 

 Soc, 88A, 83 (1913)- — -Avogadro's number is deduced from 

 measurements of atmospheric transparency. Review of theory 

 of scattering in relation to atmospheric transparency. Nature, 

 93, 557 (1914) — Rayleigh's law of extinction and the quantum 

 hypothesis. Nature, 95, 701 (1915) — speculation concerning 

 the presence of gases in interstellar space. Proc. Roy. Soc. 

 Canada, 8, III., 59 (1914) — determination of Avogadro's 

 number and the electronic charge. 



