Nipher — The Law of Conlractioii of Gaseous Nebulae. 147 

 Equating these two values of yW' 



dR^^ li dll^lH' \dnj + T^ /'"=0....(9) 

 This equation is satisfied by the primitive, 





Since 



iry _ 1 



By (6) and (11), 



n— 1 



A'-"/ 4n-Sn' x^-- (12). 



C' I (2 — n) 2'jrkB^ I 



These three equations satisfy equations (1) (3) and (4). 

 The mass internal to i? is 



r 



M= 47r WBdB 



Inserting S from (11) and integrating, 



/ 2 — 7i\ /^ (4n— 37i2)\2^„ 4_3„ 



^ = ^4^:37^ U-rrk (2-71)0 i?^-'- (13) 



The weight of a gramme at the surface of this mass is 



g=k^ = i^k /2_^^ V^di'n^'DX^ _L . (U) 



