296 



K. Tsuruta on the Alleged Sign of 



fair degree of approximation ; we may then take the tempe- 



dv 

 rature-coefficient -^ equal to — 0'256. 



.This value, as well as —0-3033 obtained from Battelli's 

 measurements, is considerably greater than that which is 

 usually taken after Clausius, namely —0*079. On substi- 

 tuting those values in the formula 



7,-^ _ 1 J 



fl — ?m rp t -Q., 



T 



I obtained 



A=0*3675 +0-0005916. T- 

 and 



178-501 



T 



(Battelli), 



163-16 



A= 0-3675 + 0-0005916 . T- 1 (Ramsay and Young), 

 which may further be illustrated by the following table : — 



t. 



h. 



t 



h. 



o 

 +25 . 



-0-055 



o 







-0-125 



+20 



-0-068 



- 5 



-0140 



+15 



-0082 



-10 



-0-156 



+10 



-0-096 



-15 



-0-172 



+ 5 



-0-110 



-20 



-0-188 



Thus the specific heat h came out to be negative at ordinary 

 temperatures, and would vanish at quite an attainable point. 

 One of the data which Clausius has made use of is the total 

 heat \ of ether which is required to raise the temperature of 

 1 grm. of the substance from 0° to t°, and to convert it into 

 saturated vapour at that temperature. It is represented 

 according to Regnault by 



in which <z=94, 6=0*45, c= — - 00055556. It was supposed 

 to consist of two parts, namely, 



X — v+ I c p dt, 



so that the remainder obtained by subtracting from \ the 



