206 ROCHESTER ACADEMY OF SCIENCE. [June 22, 
The widespread distribution of the elements of the cerium group in the 
form of the easily decomposed orthite may perhaps beara relation to 
the phosphatic nodules, evidently of secondary origin, containing these 
elements in the diamond gravels of Brazil (Gorceix, Bul. Soc. Min. 
de France, Fol. VII, 1884, page 179) and which will probably be found 
elsewhere. 
Rutile was noted in the granite of Ryegate, and Craftsbury 
(orbicular granite) Vt., and Silver Mt., Madison Co., Mo., and in the 
gneiss of Ayer, Mass., and East Pond, Waxefield, N. H. The very 
abundant mineral referred to rutile in the latter may prove to be cas- 
siterite. 
Apatite is about as universal as zircon in the rocks examined and 
is usually quite abundant. 
In the course of the examination several indeterminable minerals 
were met with of which the most notable are yellow isotropic grains, in 
the granite of Somesville, brown isotropic ones in that of Winnsboro, 
S. C., and white ones with a bluish cast in that of Vinal Haven that 
may prove to be corundum. 
The rocks examined but not specially mentioned in the foregoing 
are the granites of Milford, Mass., Dedham, Mass., Newberry, S. C. 
and Fairfield, S. C., and the oligoclase gneiss of Swanzey, N. H. 
