1884. 77 Trans. N. Y. Ac. Set. 



Dr. N. L. Brixton made some remarks, illustrated by a series 

 of specimens, on the subject of 



OBSERVATIONS ON THE GEOLOGY OF THE VICINITY OF GOLDEN, 



COLORADO. 



DISCUSSION. 



The President referred to the immense collection of the fossil 

 plants which had been made at Golden, by Prof. Lakes, and pur- 

 chased for the museum at Cambridge, Mass. Many of the plants, 

 chiefly of the upper series and Tertiary age, have been studied by 

 Lesquereux, who has published a large volume on the subject. 

 Nevertheless, all these studies have covered only the beginning of the 

 extensive flora which is represented at this locality. Palms must have 

 abounded there in great numbers, variety, and large size, the country 

 having once been overgrown by a vast forest of these trees. There 

 were also other trees, some yet to be identified, e.£-., one unknown 

 conifer, of which a trunk, twelve feet in diameter, is now standing 

 at Florissant, in the vicinity of Golden. 



Dr. John S. Newberry then presented, with lantern illustrations, 



NOTES ON A VISIT TO SOME OF THE SNOW-PEAKS OF OREGON. 



JVIarch 24, 1884. 

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

 Eighty-five persons present. 



Mr. G. F. KuNZ stated that while unpacking some specimens of 

 fluorite from Amelia County, Va., he had noticed the display of 

 phosphorescence, a pale greenish light, by the mutual attrition of 

 the specimens, the same being excited also by the warmth of the 

 hands ; by the heat of a candle this phosphorescence was increased, 

 and on a red-hot stove became a deep emerald green. A specimen 

 that phosphoresced in warm water was also shown. In Phillips' 

 " Mineralogy," edition of 1823, a specimen of fluorite is mentioned, 

 which yielded light by the warmth of the hand. He had since ex- 

 amined fluorite from over a dozen localities and had found that 

 only chlorophane yielded phosphorescent light by attrition. 



The attrition causing phosphorescence, Mr. Kunz said, was new, 

 and as the same result was produced by chlorophane from Branch- 

 ville, Ct., it was said to be a new distinguishing characteristic be- 



