152 Trans. Acad. Sci. of St. Louis. 



computes the specific heat of gravitational contraction as 

 follows : — 



By a well-known equation 



C C 



dQ=jf vdF + —^ Pdv. 



From the equation of a perfect gas, 



dT=jj vdP -^ jjFdv. 



Hence for the specific heat 



dq ^* p 



dP dv 



From eq. (3) 



dT dP dv 



dP dv 



P V 



This equation in (29) gives 



dQ Cp — nC^ Cp/K — n^ 



dT 



Op 

 where /c = -^r = 1.41 



4 



Assuming n=- Ritter obtains 



o 



For hydrogen Op = 3.409, which gives 



dO 

 ^^=-0.547. 



(29). 



1 — 71 K \1 — n/ ^ ^ 



I? =_ 0.16312 Op (31). 



