Vnl.AU. P. 297, 



Hate II 



Vi<,.l. 



Itlt-l 



I''if.'- 



fira2" 



M 



117 "I I 



::: ?V2 



Fur. 3. 



rv * 



£ 



t'i^ U, 



fig. 12. 



m S, 



WiMMATWN OF TWIN (TliYSTAlLS 



