4g 



THE DYNAMICAL THEORY OP OASES. 



+ A t M t (r h -r ll + {.-, -2^?, 



(37); 



( Jf, - Jf.) (f ,17, + &,)} - 3AJI . ( - 





(39), 



using the symbol 8, to indicate variations arising from the action of molecules 

 of the second system. 



These are the values of the rate of variation of the mean values of 

 f'i (itn ^d |P?> for the molecules of the first kind due to their encounters 

 with molecules of the second kind. In all of them we must multiply up all 

 functions of , 17, , and take the mean values of the products so found. As 

 this has to be done for all such functions, I have omitted the bar over each 

 function in these expressions. 



To find the rate of variation due to the encounters among the particles of 

 the same system, we have only to alter the suffix (t) into (J) throughout, and to 

 change K, the coefficient of the force between M l and M t into K lt that of the 

 force between two molecules of the first system. We thus find 



(42); 



