42 
189. Specimens of the GRANITE INTRUSION at Harrison, West- 
chester Co., N. Y. Collected and exhibited by Heinrich Ries. 
A great intrusion of granite has penetrated the mica schists and 
has had a gneissoid structure induced in it by dynamic meta- 
morphism. (Described before the Academy Feb. 18, 1895.) 
190. Series of TOPOGRAPHICAL MAPS of portions of New York 
State so far as yet issued by the State Engineer, in co-operation 
with the U. S. Geological Survey. Exhibited by J. F. Kemp. 
191. Specimens of GABBRO AND RELATED ROCKS, from an outly- 
ing area of the Cortland series, near Croton Falls, on the Har- 
lem R. R., N. Y. Collected and exhibited by Heinrich Ries, 
To be described before the Academy in the spring of 1895. 
The eastern limits of the igneous area, best developed in the 
town of Cortland, near Peekskill, have never been well worked 
out. This discovery provesthem to extend in outliers over into 
the Harlem valley. 
192. Specimens of PRE-CAMBRIAN ROCKS, from Blue Wing, Gran- 
ville Co., North Carolina, showing the copper ore and associ- 
ated rocks of that region. Collected and exhibited by J. J. 
Stevenson. 
(Twenty-seven specimens.) 
These slates are termed Huronian by Prof. W. C. Kerr, and 
lie between two areas of Laurentian. Within Granville and 
Person counties they show many veins carrying ores of cop- 
per, but the concentration is rarely sufficient to make mining 
profitable. The ores are chalcocite, bornite, chrysocolla, 
and occasionally malachite and azurite. 
193. Specimens of LAvAs from the Sandwich Islands. Collected 
by C. H. Hitchcock and exhibited by J. J. Stevenson. 
(Fourteen specimens.) 
194. A series showing the occurrence of REDONDITE and its asso- 
ciated rocks. Collected by C. H. Hitchcock and exhibited by 
J. J. Stevenson. 
(Ten specimens.) 
Redonda is a volcanic island belonging to the Leeward group, 
