78 Mr. S. B. McLaren on the Emission and 



waves of period greater than this the product e tp l ~ to) is 

 accidental in sign. The second term on the right of (32) and 

 its conjugate also contribute nothing to (34). They give 



e ,{^+0 ligi pt iv n ie -'ph v j7) + Conj. 



ip 



= *&+p. IjVjGiVjH) + Oonj., 



*P 



since t x does not contain p. This last expression consists of 

 two conjugate imaginaries and reduces to zero. The whole 

 absorption therefore is derived from the last set of terms in 

 (31) and (32). It is at the rate 



2 (« + « 



A ^| i( V^.M„-V^.M„0^{|;i 1 |^} + Con j .(3 5 



It is easily verified from the form of /\ that 

 X/-M„ = and 2-^M/^O, 



n —lClK n n = itlfC n 



(35) becomes 



-^i>.*e( m .j; i '§«***) 



Now, whatever function ty may be of the coordinates and 

 momenta, 



dty __ n = 6 dty dx dyfr dy dty dz 



d&n n=\dx df€ n dy dic n dz dtc n 



dty dp dty dq dty dr 



dp dfc n dq d/c n dr die 



And on solving these equations 



n — 



?i—l ClfC n 



n=6 d ^ 



V r | = YM,;* (37) 



V p f=SM;f (38) 



(36) can be written 



