( 517 ) 

 TABLE IV. 



between 25 and 85 ats., and a temperature of 16° C. As unit of volume 

 tlie volume at 16° C. and 1 atm. has been used ; so iu order to be 

 able to compare these results with those found later, all the observed 

 A'olumes must be multiplied with 1,05873, and we can also calculate 

 the pressure at 15°, 7 from the pressure at 16° with the aid of the 



dt^ 



calculated before. 

 It appears in the graphical representation of pv as function of 



-, that the last series of observations, starting with 100 ats., can 



V 



by no means be considered as a continuation of the former series 

 which ends at 85 ats, so that it is impossible to use the two 

 sei'ies together. 



In the second column of table V the results of the measurements 

 in 1864^) arc given, reduced to 15°, 7 C. and to the normal volume as 

 unit of volume ; in the third column those which have been extra- 

 polated in the way described above from the observations of 1893; 

 in the fourth column the differences have been given in percents. 



For the following reasons the later measurements seem more 

 accurate to me. l""* The differences between two scries of determina- 

 tions found in the later measurements ("methode des regards" and 

 "methode des contacts") amount to at the utmost 0,1V„ at 15°,7. 2^^*^ 

 The manometers of Desgoffe used in these determinations have been 

 compared and the deviations are not great, specially for high pres- 



1) 1. c. Table II. 



34* 



