Trans. N. V. Ac. Scz. 100 Mar. 5, 



The President communicated to the Academy that a Commit- 

 tee of the Council had conferred with the Trustees of Columbia 

 College, in reference to a room in their new building on East 

 Forty-ninth street, in which to hold the meetiHgs of the Academy, 

 and that they had given permission to occupy a room for this pur- 

 pose, free of rent. It was 



Resolved, that the thanks 'of the Academy be presented to the 

 Trustees of Columbia College for the permission they have given 

 the Academy to hold its meetings in the College-buildings. 



March 5, 1883. 

 Regular Business Meeting. 



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



Fifteen persons present. 



The following persons were elected Corresponding Members : 



Prof. LuiGi BoMBicci, University of Bologna, Italy. 



Prof. Antonio D'Achiardi, University of Pisa, Italy. 



Prof. G. Grattarola, Inst. Superior, Florence, Italy. 



Dr. A. Weissbach, Bergakademie, Freiberg, Saxony. 



M. Emile Bertrand, 15 Rue du Tournon, Paris, France. 



M. A. Jannetaz, College Sorbonne, Paris, France. 



Prof F. Pisani, Paris, France. 



The Chairman exhibited a fine specimen of gold, associated 

 with black oxide of manganese, from near the surface of a vein of 

 quartz, in Southwestern Colorado, and also crystals of topaz, locally 

 denominated quartz, from Nevada. 



Dr. T. Egleston stated, that in 1862, two topazes were brought 

 in by the Pacific Railroad Survey, which, after careful examination, 

 lead him to announce that tin would be found in the vicinity from 

 which they came. In 1874, he saw at Salt Lake City several 

 specimens which were supposed to be a curious distortion of quartz, 

 from Southern Utah, which turned out to be topaz. The discovery 

 of these crystals, with the same associations, and of exactly the same 

 form, as in Xacatecas, in the vicinity of tin mines already worked, 

 is extremely important, as it implies the presence of tin, associated 

 with these crystals, within the borders of the United States. 



In speaking of the crystallized gold specimens, exhibited by Dr. 



