124 A PERMANENT DISTRIBUTION IN WHICH 

 where 0^, V 2P , and V q are connected by the equation 



i p + 2p + e q = constant = e. 

 Accordingly 



J V lp dV 2p dV q = e-* V, (397) 



and we may write 



;r 2 , 2 j /onON 



2p | 6 = e^l = -^| e , (398) 



and 



O f) 



r \ _ _ ^ I __ ^ | ('399') 



Again, if w x > 2, 



C 9 = (ft (ft 



~* C^'jir "*"** 



= e J ^ dF i= ir* 



Hence, if ^ > 2, and w 2 > 2, 



_ 2p _ f i 1 N -1) _ /I w -IN f -11 



de ~de~l '* "~ '' p ^ ~ ^ ~~ ' p ' 



We cannot apply the methods employed in the preceding 

 pages to the microcanonical averages of the (generalized) 

 forces A v Ay, etc., exerted by a system on external bodies, 

 since these quantities are not functions of the energies, either 

 kinetic or potential, of the whole or any part of the system. 

 We may however use the method described on page 116. 



