Manchester Memoirs, Vol. Iviii. (1914), No. 1^. 9 



The sole condition in regard to .V and T is that they 

 shall be conjugate functions. 



In regard to Pu, Qo and f/„ we obtain on elimination 

 of P^Q^R 



oxoy 



6'P„ d'U ?)'Q^ 



— +2 °+_^" = (j (16). 



dx' dxdv dv' ^ ' 



