12 



several nevr species will, at no distant period, be added to 

 the list; and that this metal is more widely distributed, and 

 more generally diffused, and plays, perhaps, a more im- 

 portant part, than is at present suspected. 



MENAC, GENUS. 



tUe.-...{^; 



Kutihte. 



Cs. Nigrine. 

 \4<. Menacai 

 '5. Iserine. 



Tribe of Menacane \4. Menacane. 



Iserine. 



FIRST SPECIES. 



RUTILE.* 



Titanite of Kirwan. 

 Rutil of Werner. 

 Sageiiite of Saussure. 



EXTERNAL CHARACTERS. 



The colour varies from light hyacinth to dark brownish red." 

 Is found crystallized. 



V. In 



* Probably the anatase of Hauy is a variety of Rutile. — R, J. 



