492 Mr. W. Sutherland on Molecular Force 



to Rontgen and Schneider's results for compounds of Na 

 (Wied. Ann. xxix.). 



Table XIII, 



NaCl. NaBr. Nal. NaN0 3 . Na 2 C0 3 . 



P 2 -083 -134 -187 -114 -138 



P 1-058 1-112 1-165 1-079 1146 



10V ... 394 401 405 402 304 



p 2 -040 -069 -095 -057 -069 



p 1-028 1-054 1-078 1038 1-071 



10V ... 429 432 434 432 377 



These measurements were made at temperatures near 18° 

 C, at which lO^i for water is 467, and they give the follow- 

 ing values of 10~ 2 (1//a/o 2 — l/^i/O//^ : — 



NaCL NaBr. Nal NalSTOg. Na 3 C0 3 . 



157 -89 -171 261 



148 -87 -168 18 245 



Similar results are given by their data for the compounds 

 of Li and K. The data of M. Schumann (Wied. Ann. xxxi.) 

 show what he calls anomalies at very low concentrations, and 

 at these strengths do not satisfy the equation ; but at the 

 higher strengths his results are in accord with the equation, 

 so that probably there is some source of experimental error 

 which is responsible for the seeming anomalies, and accord- 

 ingly in using Schumann's data below for CaCl 2 , SrCl 2 , and 

 BaCl 2 only those solutions in which p 2 is greater than *1 have 

 been employed. 



To the values of (1/fjLp 2 + l//jL 1 p 1 2 )/p 2 we have only to add 

 2/fjbipi 2 to get quantities proportional to iA 2 1//( 1 A 1 qAqY, and 

 if xAg/dAx 2 A 2 )* is constant, these values multiplied by M 2 , 

 the molecular mass of the dissolved substance referred to the 

 H atom, must yield quantities proportional to (M 2 2 / 2 ) 3 . The 

 following table contains the values of 



i <r 2 { (i/ w 2 - 1 W! 2 )/^ + 2> lPl 2 } , 



and its ratio to (M 2 2 / Q )*10 2 for compounds of Li, Na, and K 

 from Rontgen and Schneider's data, and for the chlorides of 

 Ca, Sr, and Bafrom Schumann's at 15° C, his value of 10 7 ,ui 

 for water being 464. The values of (M 2 a / 2 )* are given in 

 previous tables in this paper. 



