422 



Allen, Crenshaw, and Merwin — 



Fig. 4. 



Percent wurtzite 



T5 

 (D 



-i 



o 

 o 



D 

 c* 



I 

 ro 



o 



en 

















































■**- 



-..„ 













































■*"*- 



-„. 



.^ 

































































o 























36V 



) 

















<§> 









































ft 























































































































o 



() 



















* 



» 















































































«s 



D 5 



oo" 

























































C) 











































































































































^ 



r^ 





















• e 























































■■ 













































































































































































































































































Fig. 4. Showing influence of acid concentration on the crystalline form of 

 zinc sulphide at 250°, 300° and 325°. = 250° ; = 300° ; # = 325°. 



