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



computes the specific heat of gravitational contraction as 

 follows : — 



By a well-known equation 



C C 



dQ =jj vdP + jr Pdv. 



From the equation of a perfect gas, 



dT=jj vdP + jj Pdv. 



where /c = y=^ = 1.41. 



4 

 3 



Assuming ?i = - Ritter obtains 



For hydrogen C p = 3.409, which gives 



dQ 



(29). 



This equation in (29) gives 



dQ Cp — nC, Cp(k — n\ 



ST= i-„ • ^TlTrrJ- (30) 



^ = —0.16312 Cp (31). 



