290 



and also - 



K. Tsuruta on the Alleged Sign of 

 for the particular temperatures 4- 50°, + 100 c 



■dv 



+ 150°, and so on. To have the values of the last quotient 

 for other temperatures below +120° I proceeded in the 

 following way. A large diagram of isothermal s with pres- 

 sure and volume as coordinates was first constructed, and 

 the formula known as Avenarius's 



v=a + &logio(194— t) 



was employed to connect the temperatures and corresponding 

 volumes at a given pressure. For the pressure of 2200 cm. 

 of mercury it was found that 



a=3-2811, 6= -0-844. 



The volumes were then calculated for various temperatures, 

 and the representative points on the isopiestic were joined to 

 the corresponding points on the liquid line by isothermals, 

 which were assumed as straight. Measuring the inclinations 

 of these isothermals against the axis of volume, I obtained the 

 numbers in the first four columns of the following table. 



~dp ' 





V 







1 

 According to Grimaldi. 



t. 







5t« 



dp ' 





on the 

 liquid line. 



on the 

 isopiestic. 



1 9t«, 



dp 



+120° 



1-735 



1-7036 



-0-0000217 





100 



1-638 



1-6172 



121 



-0-00000632 



-0-0000110 



80 



1-562 



1-5451 



89 



517 



81 



60 



1-5020 



1-4859 



79 



407 



61 



40 



1-4505 



1-4349 



74 



316 



46 



20 



1-4025 



1-3901 



58 



258 



36 







1-3583 



1-3502 



37 



207 



28 



These values are certainly not exact, but they are sufficient 

 to show the order of magnitude of the quotient. Another 

 source of information was found in the measurements of' 

 Grimaldi * on the compressibility of ether from 0° to + 100° 



* Grimaldi, Wied. Beibldtter, pp. 473-476 (1886). 



