188G.] NEW YORK ACADEMY OF SCIENCES. 231 



April 26, 1886. 



Stated Meeting. 



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

 Fourteen persons present. 



Mr. William Earl Hidden read a 



preliminary note on an iron meteorite from maverick 



CO., TEXAS. 



This meteorite was found in June, 1882, by C. C. Cusick, of 

 the U. S. Army, on the surface of an old river terrace of the Eio 

 Grande, near Fort Duncan. It possesses characteristics which 

 distinguish it from the famous Cohahuila meteorites. It is rich 

 in schreibersite and troilite. 



The mass is 12x10x6 inches, and is oval to a marked degree. 

 Its weight is 97| pounds. It has passed into the writer's posses- 

 sion. 



Mr. Hidden said that he had prevented the decomposition 

 of meteorites by using a varnish of collodion containing 5 to 6 

 per cent of Canada balsam. 



Mr. B. B. Chamberlin exhibited marcasite from the exca- 

 vation for the new building of the Metropolitan Art Museum. 



Dr. A. A. JuLiEN read a paper 



•ON THE variation OF DECOMPOSITION IN IRON PYRITES, ITS 

 CAUSE, AND ITS RELATION TO DENSITY. 



(Published in the Annals, Vol. III., No. 12.) 



The subject was discussed by the President, Mr. Hidden, and 

 the author. 



