424 E. W. Morley— Cause of the Variations 
I cannot suggest an explanation of the deficiency i in oxygen 
which occurred May 21st and 22d. 
May 26th.—At 7 A. M. there was an area of high pressure 
over Georgia, with winds spreading in all directions “around the 
landward side of a circle. At 9 A. M. the oxygen found was 
0:20919. 
June 17th—At 7 A. M. there was a large area of slight ex- 
cess of pressure covering most of the Northwestern States. On 
the 18th at 7 a. M. the high pressure had moved to the east, 
and the highest pressure observed was at Cleveland. Under 
its influence, the amount of oxygen found at 9 a. M. was 
0:20933. 
The deficiency of oxygen observed on gs 28th I am not 
able to explain; the data being insu 
Having made my application too inte, T have not obtained a 
series of the thrice-daily weather maps for comparison with my 
observations on variations in amount of oxygen for a period of 
six and two-thirds months beginning with October, 1880. A 
comparison of my observations with the daily morning maps 
leaves some facts unexplained which the possession of fuller 
data might clear up satisfactorily. All the maps used being of 
the seven o'clock series, it will not ae needful to specify as 
hour further; the observations of oxygen were all made 
the same time with the observations tie which the maps were 
ma 
I ge explain the deficiency of oxygen occurring on 
October 4th. 
On October 5th there was a long narrow area of high pres- 
sure reaching from New England to Texas. The spreading 
out of the air on each side of this area was well marked, the 
inference that there was a descent of upper currents to the 
surface is well sustained, and the oxygen found was 0°20952. 
October 7th. An area of high pressure had its center near 
ke Erie, with winds SS outward in all directions. 
The oxygen found was 0:20952, a fall of 0-00010. 
October 10th.—A long narrow area of high pressure extended 
from Maine to Texas. The radiation of winds in all directions 
was decided, and the inference that downward currents min- 
oe the surface air with air from an elevation reasonably prob- 
he oxygen found here was 0:20958. But this was a 
fall. of only 000007, which is a pretty small difference. The 
probability that there reall y was a fall in the amount of oxygen 
is only about six to one. 
The deficiency of oxygen on October 22d I cannot explain. 
Deke the 25th, hsecoean were — in all directions from an 
ea of high p tern Tennessee. The oxygen 
foatd was 20950, + a fall of “0-00017 from the previous day. 
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