364 



DETECTION OF SUBSTANCES. 



[CH. XIV. 



tt 

 



r* o 



! 



o jy 

 rt rt 



3 





- I 



c 



o ^ 



'5 w 



1 ^ I 



' ' yd c "r 

 ri ju 2 



8 o^ 



(A o 



W 



-So C^ 



1/5 '& i 



** en 



e 2 S 



III 



H -Q ^J 



