212 RECORDS OF THE AUSTRALIAN MUSEUM. 



Forms and angles: — 



In conclusion I have to record my indebtedness to Messrs. G. Smith, 

 D. A. Porter, and A. Combe (whose transference to the Geological Survey 

 of Uganda is a signal loss to Australian mineralogy), for the loan of 

 specimens, for donations, and much useful information, and to my 

 colleague, Mr. T. H. Smith, for valuable assistance in measuring and 

 drawing the crystals and checking the calculations. 



