334 



Mr. W. J. Sell and Prof. W. J. Lewis. [Feb. 14, 



Fm. l. 



The forms found are a 100, I 210, m 110, p (!!!), % 101, 



The elements are : 



010, Oil = 59 51 ; 001, 101 = 22 58 ; 100, 110 = 53 43 ; 

 or a : I : c = T3705 : 1 : 0'580843. 



The angles observed are compared in the following table with those 

 calculated from the elements : 



Calculated. Observed. 



ram ........ 53 53 



I mm ........ 72 14 72 18J- 



Im 



PPi 



19 27| 



54 17 54 13J 

 71 26 71 271 



