EXPERIMENTS ON ALLAN ITE. 47 



tnetal for oxigen". Supposing the compositions of the wa- 

 ter in the iirsst instance to take place according to Mr. 

 Davy*s views, then, in the second, the oxirauriatic acid 

 is attracted from the tin by the ammonia, at the same time 

 it attracts, in its turn, the hidrogen of the water; and as by 

 the attraction of the ammonia the affinity between the oxi- 

 muriatic acid and ^m is weakened, the tin by this beini^ 

 enabled to attract the oxigen of the water, and thepximuri- 

 atit acid attracting the hidrogen, the water is decomposed, 

 and the oxide of tik and muriate of ammonia are formed. 



I am, Sir, 



Your humble servant, 



Mdinbtirgh, April theQth, W. CRANE. 



1811. 



VIII. •* 



Mxperiments on Allanite, a new Mineral from Greenland^ 

 by Thomas Thomson, M, 1). R R. S. E. Fellow of the 

 Imperial C/iirurgo-Medical Academy of Petersburg L* 



BOUT three years ago, a Danish vesself vvas brought Collection of 



into Leith as a prize. Among other articles, she contained ["'"frals in a 

 . " Danish prize. 



a Sinai! collection of minerals, which were purchased by 



Thomas Allan, Esq., and Colonel Tmrle, both members of 

 this society. The country from which these minerals had 

 been brought was not known for certain ; but as the collec- 

 tion abounded in cryolite, it was conjectured, with very con- 

 siderable probability, that they had been collected in Green- 

 land. 



Among the remarkable minerals in this collection there One of -these 

 was one, which, from its correspondence with gadolinite, as -"PPJ^sed^to be 

 described in the different mineralogical works, particularly 

 attracted the attention of Mr. Allan. Confirmed ia the 

 idea of its being a variety of that mineral by the opinion of 



♦ From the Transactions of the Royal Society of Edinburgh. < 



•f- Der Fruhling, Captain Jacob Ketelson, capturad on her passage from 

 )cel«ad to Copenhaj;en. 



Count. 



