12 TRANSACtlOjq^S OF THE [OCT, 11, 



October 11, 1886. 

 Stated Meeting. 

 The President, Dr. J. S. Newberry, in the chair. 

 Thirty-six persons present. 



Mr. GtEORGE p. Kunz exhibited artificial rubies from Paris, 

 as supplementary to his paper read at the preceding meetiuir. 



President Newberry stated that the library of the So< iety 

 had been removed, during the summer, under the aurlioiity 

 delegated to the President and Secretary, from the AnxM'ican 

 Museum of Natural History to the Herbarium room in tlie Li- 

 brary Building of Columbia College. That theconditions under 

 which the College received the library on deposit were, the con- 

 tinued and absolute ownership of the library by the Academy, 

 with the privilege of terminating the contract at any time ; and 

 the College to bind and otherwise care for the library equally 

 with its own. 



Dr. N. L. Britton read the announced paper, 



ADDITIONAL NOTES ON THE GEOLOGY OF STATEN ISLAND. 



On April 4th, 1881, I had the honor of i)resenting to the 

 Academy the results of my studies on the Geology of Eiclimond 

 County, New York. On December 12th, of the same year, I 

 presented some additional notes on tlie same subject, and on 

 November 24th, 1884, read a paper on the Griacial and Pre-Ghicial 

 Drifts of Staten Island. I now desire to bring forward other data, 

 obtained by myself and associates since this hist communication. 



No new outcrops of granite or gneiss have been discovered; 

 those at Tompkinsville have, indeed, been partially covered by 

 the embankment for the Rapid Ti'ansit Company's railroad, and 

 only a small ledge is now to be seen. It is to be noted that this 

 coarse granite contains oligoclase feldspar in uddition to its or- 

 thoclase, and the probability is that the outcrop is the exposed 

 top of a mass, perhaps a vein, similar to those of common oc- 

 currence on New York Island and in Westchester County. 



In my communication of December 12th, 1881, allusion was 

 made to an exposure of hornblende-rock on the shore of the 

 Upper Bay at Bi'ighton Point. Tliis is an extremely tough, 

 fibrous tremolite, hardly any other mineral being ])resent m it. 

 The outcrop showed no bedding planes; it is now wholly con- 

 cealed by the made land around the railroad terminus at Saint 



