104 



BRIDGMAN. 



From the diflference of compressibility between I and II the differ- 

 ence of thermal expansions and the difference of specific heats may be 

 calculated in the usual way. The results are collected in Table IV. 

 I is throughout more expansible than II, and has a smaller specific 

 heat. 



The difference of compressibility between liquid and solid may be 

 approximately calculated in the usual way, on the hypothesis that 

 ACp = 0. The results are shown in Table V. The behavior of Aa 

 for L-II is remarkable, at first increasing with rising pressure and 

 then falling. The effect probably really exists, and is not to be 



TABLE IV. 



ACETAMIDE. 



Difference of thermal expansion and specific lieat between I and II. 



explained by experimental error, liecause the figures indicate that at 

 the triple point I is less compressible than II, a result already reached 

 by independent method. This is not the first time that we have found 

 that a new phase in the neighborhood of the triple point is abnormally 

 compressible. 



The directly measured difference of expansion between L and I 

 at approximately atmospheric pressure was O.O354. The value found 

 by Block ^^ was O.O342. The assumption that ACp = probably 

 does not give values of A /S at higher pressures worth recording, because 

 on this assumption we find that at atmospheric pressure A/3 has a 



