( 745 ) 



Tok \ d.c J, 7'o/, 1/ r 



/>oit V f^*' yo ï'ot Vk pit pit/ 



\k Tolcplk 



(5) 



iiaiuelv for tliose mixtures for which tlie a and /? had been already 

 derived from tiie observations by the application of the law of cor- 

 responding states. The computed values are given in the following 

 table; the values in brackets follow from the ojjservations. 

 CO, with CH3CI « =r 0,363 (0,378) /J = — 0,149 (0,088) 



CH3CI with CO, —0,270 (—0,221) 0,068(0,281) 



CO, with H, —0,978 (—1,219) — 0,439 (— 1,645) 



CO, with 0, — 0,513 (— 0,6563) — 0,242 (— 1,0871) 



Of principal importance are here the signs of the « and i?, and 

 in tills respect there is a good agreement, when we except the jJ for 

 CO, with CH,C1; I must remark, however, that from the experiments 

 of Kkixkman a negative /? is derived for this mixture '). 



3. With the derived values of u and ^ we now, using the formulae 



constructed by Keksom and me, might compute the quantities 



fdTy^l\ fdp,pi\ 



I — - — I, I — — 1 and others ; but as our principal concern is the 



signs of those quantities, it is supertiuous to perform tliese com- 

 putations. In fact, we immediately obtain a survey of the pro- 

 perties of the mi.xtures with a small proportion of one of the 

 components when we draw the values of « and ji as I have done 

 before ") ; this time of course in a diagram, based no longer on the 

 empirical equation of state used then, but on equation (1). It is 

 still easier, by means of the formulae given in Comm. Suppl. n°. 5 

 (Proceedings May 30, 1903) to exjiress the « and ^ in Korteweg's ') 

 X and 7, and then to use his diagram which, as is known, is 

 based on the original equation of state. Thus we find that the points 

 («, f}) — or (x, y) — lie exactly in the fields which correspond to the 

 properties of the mixtures ; here also, therefore, the investigation has 

 a favourable result. 



4. I shall now communicate some computed values of 7*3:^ and ^j^rit 

 for the mixtures under consideration, and compare them with the 

 values derived from the observations. (See following table). 



1) Loc. cit., p. 73; comp. also the table on the following page. 

 S) Comm. Suppl. no. 6, Proc. 30 May 1903. 

 '^) Proc 3J Jan. 1003. 



52* 



