630 



PROCEEDINGS OF WASHINGTON MEETING. 



288. Snow-storm in Elk mountains, Gunnison county, Colorado. Lake in foreground, 



at 11,500 feet, is just south of Maroon pass. The storm is rapidly descending 

 to lake. Size, 8 x 10 inches. Photographed bv C. Whitman Cross, October 9, 

 1880. 



289. Meridian lake, near Crested Butte, Gunnison county, Colorado. One mile long, 



200 to 500 feet wide. Occupies the crest of a ridge of soft Cretaceous shales. 

 Crested Butte mountain in background. Size, 8 x 10 inches. Photographed 

 by L. G. Eakins, September 2, 1887. 



290. Sandstone in Hudson shales, town of Argyle, Washington county, New York. 



Size, 6x8 inches. Photographed by C. D. Walcott, 1887. 



Fellows of the Geological Society who desire to obtain copies of any of the above 

 photographs, or lantern-slides from the same negatives, should apply to the Director 

 of the United States Geological Survey, Washington, D. C. The photographs are 

 not kept in stock, but will be printed as ordered with such promptness as the regular 

 work of the photographic laboratory of the Survey will permit. 



10x13 



Unmounted prints. 

 Mounted prints 



4x4| 



5x7 



6x8 



8x10 



$0 05 

 06 



$0 08 

 10 



|0 10 

 12 



10 12 

 15 



$0 20 

 30 



Lantern-slides, $0.30. 



Professor W. B. Dwight, of Poughkeepsie, New York, presented three photographs 

 of his rock-slicer. They are numbered 291 to 293. 



No. 291. General view of the machine, of which the label contains a full descrip- 

 tion. 



No. 292. Special view of parts of the machine, of which the label contains a full 

 description. 



No. 293. View of drawings, illustrating special features of the machine. 



The above report was by vote accepted, the committee continued, and an 

 appropriation of twenty-five dollars (S25.00) made to defray expenses. 



The last paper of the evening session, illustrated with lantern views, was 



OBSERVATIONS UPON THE LAVA DEPOSITS OF THE SNAKE RIVER VALLEY, 



IDAHO. 



BY G. F. WRIGHT. 



The Society then adjourned to the following day at 9 o'clock a. m. 



