4. E. Loomis— Reduction of Barometric Observations. 
I next selected for examination all the cases in which, during 
a period of three years there was a decided area of high pressure 
over Mt. Washington. The results are shown in table II, 
which is constructed upon the same principles as table I. 
These numbers were then arranged in the order of the mean 
temperatures given in column seventh and were divided into 
four equal groups, and the average of the numbers in the 
several columns for each group wascomputed. The results are 
given in the first five lines of table III under the heading 
barometric maxima. 
I then proceeded to compute the remaining columns of the 
table in the same manner as has been explained for barometric 
minima. 
We see from table III that if we undertake to explain the 
differences between the pressures observed at sea-level and th 
Mt. Washington observations when reduced to sea-level in 
feet below the summit; and for the month of June 1873 is. 
iven a series of hourly observations on the summit of Mt. 
Washington and at three stations on the side of the mountain, 
one situated 732 feet below the summit, a second 2227 feet 
. 
below the summit, and a third 8387 feet below the summit. 
_ umns. The sixth column shows the temperature deduced from 
the formula — 
_ the observations at Burlington and Portland by 
4B 
Bo: 
