21 
This peculiar phase is marked with the development of 
phenocrysts of feldspar. They were furthermore pene- 
trated by gabbroitic rocks. These latter represent a new 
and undescribed extension of the Cortlandt series to the 
eastward. 
13. SERIES of Coats from Madrid, New Mexico. Exhibited by 
Erol.) J. J. Stevenson: 
These are from the Old Placer coal field and show the 
passage from bituminous to anthracite coal. 
14. Specimens of AspHaLT from Indian Territory. Exhibited 
by Prof. J. J. Stevenson. 
This material is obtained from the Upper Carboniferous 
beds of south-central Indian Territory. 
15. A series of LrEap and Zinc Ores from Joplin, Mo. Ex- 
Ge 
hibited by Prof. J. J. Stevenson. 
A series of Rock Sat SPECIMENS, collected from central 
New York by C. Q. Freeman. Exhibited by Prof. J. J. 
Stevenson. 
MINERALOGY. 
G 
In CHARGE OF EpmuND Otis Hovey. 
. LorANDITE, with REeatGar, Macedonia. A compound of 
Tl, As and S, a new mineral. 
OLIVENITE, Centennial Mine, Tintic Dist., Utah. Very fine 
crystals. 
. 
. SYLVANITE, Cripple Creek, Colorado. 
4. GripuiTE, Riverton Lode, near Harney City, S. D. A rare, 
problematical phosphate of Al, Mn, Ca, Na, etc. 
. ARGYROPYRITE and PyrarGyrirTE, Freiberg, Saxony. 
