6G J: Mr. A. A. liobb on the Conduction of Electricity 



requirements of the simple gas laws and the theory of electro- 

 lytic dissociation. Such cases as the acetone solutions of 

 CdI Q , NH 4 CnS, and Nal, for instance, which are good 

 electrolytes though the ebullioscopic determinations yield 

 molecular weights of 448'6 to 510'7, 88*1 to 101*6, and 133*2 

 to 143'0 for the respective salts, whereas the corresponding 

 theoretical values are 335, 76*2, and 149'9 "*, are consequently 

 readily " harmonized " with the theory of electrolytic dis- 

 sociation by Jones, by assuming the required amount of 

 polymerization and dissociation necessary for his purpose. 

 It is quite unnecessary to dwell upon this further, for in a 

 recent article, which should prove interesting reading to all 

 who belong to what he calls the " dilute school/' J. J. Yan 

 Laar | has thoroughly exposed the fallacy of such a course 

 of reasoning as that adopted by Jones and Getman. 



Finally, as to whether the facts upon which I have based 

 my arguments against the theory of electrolytic dissociation 

 are real or merely " supposed/ 1 as Jones would have it, I 

 shall gladly leave to the judgment of the reader. 



Laboratory of Physical Chemistry, 

 University of Wisconsin, Madison, 

 July 1905. 



LXXIV. On the Conduction of Electricity through Gases 

 between Parallel Plates. — Part II. By Alfred A. Robb J. 



THE writer has already shown § that the differential 

 equation 



a 2 X 2 fi_ 1\ f 



rf*> ~ VRi R J 1 9 e 2 X 2 (Ri + R 2 ) 2 



* The data are those of Jones, Amer. Chem. Journ. xxvii. p. 16 (1902). 

 They are somewhat different from those of Dutoit and Friderich who 

 simply state that the molecular weights are normal, without giving 

 specific figures, Bull. Soc. Chim. Paris, [3] xix. p. 334 (1898). Jones did 

 not investigate LiCl in acetone on account of its slight solubility. The 

 HgCl 2 solution had but slight conductivity, and its molecular weight 

 determination yielded the values 267*9 and 271*2 (but two determinations 

 were made) as compared with 271*2, the theoretical. This latter case 

 then presents no difficulties for the dissociation theory, as Jones well 

 states. 



t Chemisch Weekblad, ii. pp. 1 -16 See also the abstract in Chem. 

 Centralblatt, lxxvi. p. 491 (1905). 



\ Communicated by the Author. 



§ Phil. Mag. August 1905. 



