498 REPORT—1863. 
By treating the results with a clear or a nearly clear sky in the same way, 
the following results were obtained. 
With a clear sky, the degree of humidity was 
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The law of moisture here shown is a steady increase of humidity from 
the ground to the height of 3000 or 4000 feet, then a decrease by 5000 feet 
to the same as on the ground, declining afterwards, but not regularly, to the 
height of 23,000 feet ; above this point the air is very dry, but, so far as I have 
seen, never quite free from water. 
By comparing the results with a cloudy sky with those from a clear sky, 
the degree of humidity on the ground with the latter is less by 11 than with 
the former, but approximate very closely together at the height of 3000 feet; 
the air continues humid with the cloudy sky to 5000 or 6000 feet, but becomes 
less humid with a clear sky at 4000 feet, and declines, but less rapidly than with 
cloudy sky, till at 7000 feet they are again near together, and continue so to 
9000 feet ; the humidity then increases with the cloudy sky to the height of 
15,000 feet, where the air is as humid as at the height of 7000 feet ; whilst 
with the clear sky the humidity decreases to the height of 13,000 feet, but then 
increases to 15,000 feet, where the air is as humid as it was at 10,000 feet. 
It is remarkable that this humid state is in both states of the sky at the same 
elevation ; at elevations greater than this, the humidity decreases in both 
states of the sky, but more rapidly at first with the cloudy than with the clear 
state, till at heights exceeding 20,000 feet there is but little difference in 
the results from the two states, 
rontse 
