Fisher — Notes to Rival Theories of Cosmogony. 141 

 we get for the compressibility in pounds per square foot, 



1-699 X lO- 8 ^^-, 

 P 



which reduced to atmospheric pressure is 



c — .3-6069 X 10- 5 ^i^. 

 P 



(3) The above relation between the pressure and the density 

 renders it .easy to calculate the work of compression, and 



for 



work = — / pdv, 

 J v 



where 



And since 



V s 





dp 



. • . dv = — v s — ; 

 P 



and work — v n s X 5*8855 X 10 7 / P (/o 2 — s 2 ) -^ 



J 8 P 



= v s X 5-8855 X l.OMp + — — 2s J 

 - v o s X 5-8855 X 10 7 ^ ~ - . 

 And the temperature = 



J X specific heat x mass 



Mallet's value for the specific heat of rock is 0*199. The 

 mass will be s X v oi which will divide out, and thus 



temperature Fah. = -=- — '—.* 



da p 



This will give the temperature so long as we can reckon upon 

 the specific heat remaining constant, which probably will not 

 be the case for the higher temperatures, and certainly not so 

 if the substance becomes liquid or gaseous, when the latent 

 heats will disappear, but it will be sufficient to show what 

 enormous temperatures such condensation would produce, even 

 if the specific heat should be as great as that of water. 



*The log of the coefficient — is 5*5833156. 

 Jo 



