( 307 ) 



For V = 0,024 the following table gives the calculated and tlie 

 observed values of the pressure. 



In the formula p = p\ (1— ■') + p^ x -j- ,1 .?; (1— .r) wo have taken 

 A as equal to S. 



X 0,05 0,1 0,2 0,3528 0,5 0,GU5 0,8 0,9 1 



p calculated 34-,38 35,32 30,22 37,91 40,18 42,01 43,47 44,07 45,24 45,65 

 }, observed 34,38 35,53 30,54 38.04 40,12 41,80 43,33 44,80 45.48 45,05 



For the value of A which might have been calculated b\ means of 

 the relation 



(ai + «2 - 2 «is) -{h,+h,~2 h,,) (1 + a t) 

 A = , 



we should have found about 9,."), if An —^^(l + «0 = 0,005405 

 (see p. ?)9')). 



The value of p , putting A = 9,5 , agrees nearly perfectly 

 for sniali values of j- and 1 — .'•, but in this case the differences 

 are larger again for values of .*• near Ve- From A =: 8 would 

 follow A„-A6 (1 + «0 = 0,00461 i). 



From all this follows that absolute agreement between the theory 

 and the observations of Mr. Verschaffelt does not \et exist. But 

 the differences remain below 1 pCt. It would be premature to try 

 to decide as yet whether the differences are to be ascribed to the 

 theory or to the experiments. Yet we may say that in these obser- 

 vations the differences are smaller than in those that I have tested 

 before. And the fact that up to now the differences giow less as the 

 observations grow in accuracy, seems to plead in favour of the theory. 



') Til calculiitiiif; tlie coefficient in the equation 



ff — 0,999540 + 0,001139 (1— j) + 0,003405 (1— ;r)2 



we have made use of tlie data for carbonic acid and hydrogen, iiiid of the supposition 

 tiiat .y=l, if a' =0,3. 



If we take ^^^1 for .c= 0,82, the coefficients hecoine 



y=^ 0,999346 -f 0,00161S (I—.;) -f- 0,00497 (I— .5')'- • 



These values of the coefficients seem more probable to nic; niorcovoi- in liiis case 

 the values of the two tables on p. 395 agTce still better. 

 \Vitii these coefficients is 



o,„— //,o (1 H- :<0 = 0,000355 

 and 



(», + fl, - 2 r,i,) - (/., + /-, - 2 /,„) (1 + ^0 = ll.tf t'J7 . 



