and Pyroelectric Properties of Matter. 15 



\aa; / 



+ (sj).«-»+(S).(^+GS).(t-^ J 



s =(|) 

 (&).<*-*> + Gf|).&-*> + GfS) (*-*») 



+ 



\dv)( 



drj 



+ 



16. These equations express in the most general possible man- 



(21) 



