452 Cross and Hillebrand—Minerals in the basalt of 
(2.) That snow is converted into ice under a long continued 
pressure, not exceeding 2,000 pounds per square inch, and 
probably much less than that, and at temperatures near to zero 
Fahrenheit. 
(3.) That while great pains have been taken to detect the 
presence of moisture in the snow while under pressure at these 
temperatures, no satisfactory evidence of its presence has been 
obtained, the various tests failing to give it; while, on the 
we contemplate this possibility as influencing the result. 
(4.) That the evidence is not inconsiderable in favor of the in- 
fluence of time as a ma in the establishment of continuity 
between fragments of ice and between snow crystals and, inso- 
far as this Taaadorition is admitted, it militates against the 
srepechen of liquefaction and regelation at these tempera- 
ART. LIL, — Communication from the U. S. Geological Survey, 
Rocky Mountain Divi the minerals, mainly Zeolites, 
occurring in the Saat of "Table Mountain, near Grier, Colorado; 
‘by WHITMAN Cross and W. F. HiLLEBRAN 
[Tue sone of which the following is the first, are 
and analcite. The latter mineral therto been supposed b 
many per who have collected it at this to basing their 
tion on statements made in th layden Reports,* to be 
by me — when on the Fortieth Parallel Su Survey. Since 
ed Caen leucite proves to be analcite, the Leucite Hills of 
Wyoming seem to be still the only known locality of leucite in 
the United States. 
oe 8. F. Emmons, Geologist in charge.] 
ual Report of the U. 8. Geol. and Geog. Survey of the Territories for 
et. > 130 and 389, 
