534 General Notes. [May, 
Professor S. Aughey, of Lincoln, and more particularly of the 
region further west, between the Platte and Republican (vide 
Physical Geography and Geology of Nebraska, p. 59, also U. S. 
Geological Report for 1874). 
s to the cause of the rise and fall of the water in the wells of 
the region, we may conclude that it is primarily due to a varying 
pressure of the atmosphere. is may be inferred from its 
observed connection with the direction of the winds. Southerly 
winds usually attend a low barometer and winds from the north 
bring high barometer. Hence we interpret the observations under 
consideration, as showing that the water in the wells rises when 
the barometer falls, and vce versa. ; 
A circumstantial cause, so to speak, is the extensive sand deposit 
in which the water is found, and which by rising above the water 
becomes a great reservoir of confined air for the more compact 
deposits overlying its present free circulation in that direction. , 
the barometer is steady for a few days, we may suppose this 
reservoir is charged with air of uniform density and exerting unr 
form pressure over the whole surface of the water, which is there- 
serves asavent. The phenomena reported are likely, therefore, © 
become less marked as the country settles up and the number 
wells increases. 'g3,) where 
porous rocks, also from delf-pits and cesspools. a 
ese have been made to blow whistles so as to indicate by 50 
“ caverns” in the adjacent sandstone to explain the moveme ae 
ders, but cat 
ive conversation 
with a Mr. Mackie, probably one of the gentlemen ced 
. f ; jon 
items observed by him in his extensive experience in that rege 
as well-digger. Some of them, with others of my Ow tad 
tion, are the basis of my generalization above. —/. £ = 
