562 Proceedings of the Royal Irish Academy. 



Classiticatio:^ of Axu^.irN'nJir Phosphates — continued. 



Species. 



Formula. 



Theoretical Percentages of 



ALO3 



(l02-6). 



P2O3 



(142)- 



H„0 



(18). 



GROUP III. 



Caiaite, . . . 



Peganite, . . . 



? 



FlSCHBRITE, . . . 



2AI2O3, P2OS, 5 aq. 

 2AI2O3, P2O5, 6aq. 

 2AI0O3, P2O5, 7aq. 

 2AI2O3, P2O3, 8aq. 



46-93 



45-08 

 43-36 



41-77 



32-48 

 31-19 

 30-01 

 28-91 



20-57 

 23-72 

 26-63 

 29-31 



GEOUP rv. 



EVANSITE, . . . 



3AI2O3, P2O5, 18 aq. 



39-78 



18-35 



41-87 



§ XYI. In coneludiiig this Eeport, it is my agreeable duty to thank 

 the Eoyal Irish Academy for the liberal grant which enabled me to 

 secure the material upon -which I have worked. And I cannot refraia 

 from naming in this place the generous gift made to me bylTr. Henry 

 Willett, P.Gr.S., of Brighton. He learnt that a large and efficient air- 

 pump was necessary for the proper carrying out of the drying in vacuo 

 of the several mineral species analyzed during this inquiry. Mr. Willett 

 gave me for this purpose one of Bianchi's magnificent air-pumps, at a 

 cost of something like fifty pounds. 



