1885.] NATURAL SCIENCES OF PHILADELPHIA. 19 



January 20. 

 Mr. George W. Tryon, Jr., in the chair. 

 Thirty-two persons present. 



The death of Prof. Wm. Wagner, a member, was announced. 



A paper entitled " Description of a new Colias from the Rocky 

 Mountains, and of an example of Pohmelianism in Samia 

 Cecropia," by Hermann Strecker, was presented for publication. 



A New Locality for Beegerite. — Prof. George A. Koenig placed 

 on record the determination of Beegerite, from the " Old Lout," 

 San Juan County, Colorado. This species was described in 1 881 by 

 the speaker as 6PbS,Bi 2 S 3 , from Park Count}' Colorado. It crys- 

 tallizes in isometric cubo-octohedrons, with orthorhombic habitus. 

 Only one specimen was then known to be in existence. Since, Dr. 

 F. Genth has examined a specimen, massive, from Summit County, 

 Colorado, which is Beegerite, in which 15 per cent, of lead is 

 replaced by as much silver. Some months ago the speaker 

 received among other bismuth minerals from the Old Lout Mine, 

 Colorado, a small specimen of a fine granular, lead-gra} 1 " mineral, 

 mixed with chalcopyrite, pyrite, barite,and quartz. After a pre- 

 liminary examination, revealing the peculiar composition of the 

 substance, about 1*2 gram, were selected with great care, but it 

 was not possible to exclude all pj^rite and chalcopyrite. 



Of this the analysis gave : 



95-72 



If copper, iron, and the corresponding amount of sulphur are 

 eliminated as chalcopyrite and pyrite, the ratio between. (PbiAg 2 ) 

 and Bi is as 5'74 : 2, which, in connection with the loss of 4 per 

 cent, in the analysis, is near enough to the ratio : 6 : 2 to admit 

 of no doubt that this mineral is Beegerite, now known from three 

 localities in Colorado. 



January 27. 

 Dr. W. S. W. Ruschenberger in the chair. 

 Twenty-eight persons present. 



