66 K. D. Rraevitch on an Approximate Law of the 

 2nd Method. 



t. 



p. 



dp 



w 



t. 



P- 



dp 



dt' 



o 



65 



463-43 

 547-42 

 643-18 

 751-86 



20-405 

 23-105 



| 



o 



85 



874-63 

 1012-75 

 1167*40 

 134005 



26-049 

 29-233 



70 .... 



90 



75 



95 



80 



100 









75° 80° 85° 90* 



r 



... 98-517 98-188 97-877 97*526 





0-329 0311 0-351* 





00658 0-0622 0-0702 



The mean value of c—c x from the three figures of the last 

 line, 0*0661, is very near to that found above, 0*0645, and 

 the heat of vaporization 97*877 to 97*866. 



The following table of the vapour-pressures of benzene is 

 calculated from the values of x and y determined above. 



t. 



Pressures. 



t. 



Pressures. 



Calcu- 

 lated. 



Ob- 

 served. 





Calcu- 

 lated. 



Ob- 

 served. 





o 



-20 



8-83 



5-79 



9-01 



o 



70 



547-42 



547-42 



548-66 



-10 



16-28 



12-92 



16-57 



80 



751-84 



751-86 



752-38 







28-59 



25-31 



29-04 



90 



1012-72 



1012-75 



101202 



10 



48-14 



45-25 



48-76 



100 



1340-00 



1340-05 



1337-20 



20...... 



77-84 



75-65 



78-71 



130 



2827-0 



2824-4 



2811-4 



40 



184-43 



183-62 



185-78 



170 



6413-7 



6340-7 



6348-6 



60 ,.. 



39019 



39010 



391-70 











Owing to the irregularities in the values of x, I took the 

 arithmetical mean of three of its values in order to obtain a 

 more reliable result. This may give rise to a mistrust in the 

 figures subsequently determined. In order to test to what 



* See Notes at end. 



