( 511 ) 



values of the constants, appears as follows : for z = 0.5, R 'R = y 

 h Jt>,, = V 8 , { $c) yields: u = - - 1.957, after which (9) yields' 

 f t = - 1.176, so thai a M /a u = 0.00653. Thus we find for a mixture 

 of two substances with M, = 2 M 1 ,v ka = 1 / 8 v kl (so that the ratio of 

 the molecular critical volumes is l / 4 ), T k% = 0.052 7). , a harotropic 

 plaitpoint for v bul = 0.26 v ki , T bp i = 0.80 7},, , y, v = 4.8 p k} . 



(To hi' continued). 



ERRATUM. 



In the Proceedings of the meeting of September 29, 1906. 



p. 209, line 15 from the bottom: for § 10 read § 9. 



p. 210, Table I, line 5 and 4 from the bottom, for: 5 July read 



6 July. 

 „ 3 from the bottom, for 3 March '05 



read 3 March '06. 



(January 24, 1907). 



