102 #. Loomis— Observations of the U. S. Signal Service. 
the given day; column 5th shows the station at which the 
height mentioned in the preceding column was observed ; col- 
umn 6th (increased by 28 inches) shows the height of the 
barometer at the center of the low area at the end of the given 
day; column 7th shows the station at which the height men 
tioned in the preceding column was observed; column 8th 
shows the direction and velocity (in miles per hour) of the 
highest wind at any of the stations near the low center 
during the given day; column 9th shows the direction and 
velocity of the highest wind on Mt. Washington. observed 
during the progress of the storm or immediately after the 
storm had passed eastward; column 10th shows the total rain- 
fall at the Signal Service stations within the low area (barometer 
below thirty inches) during the day in question ; column 11th 
shows the distance that the rain area extended eastward of the 
center of least pressure ; column 12th shows the distance east- 
ward from the storm-center that abnormal winds extended 
(that is, winds from S., S.E., E. or N.E.); column 18th shows 
the direction of an area of high barometer, with reference to 
the low center; and column 14th (increased by thirty inches) 
shows the greatest height of the barometer within the high 
area mentioned in the preceding column. : 
Besides the cases here enumerated there are a few others in 
which storms may have advanced with equal rapidity, but 
there is so much uncertainty with regard to the exact position 
of the center of least pressure that I have preferred to leave 
them out of the account. The number of cases in the table 1s 
9, occurring within a period of 82 months which gives an 
average of 14 per year, being 24 times as many as occur In 
Europe. The greatest observed velocity of these low areas 
was 1872 miles per day, which is 40 per cent greater than the 
highest velocity observed in Europe. 
The average height of the barometer at the beginning of the 
days enumerated was 29°62 inches, and the average height at 
the end of the days was 29°42 inches, which is only half of the 
average depression observed in the storms of Europe. In 2 
of these cases the depression at the center of the storm I 
creased during the day, in 11 cases it decreased, and in one 
case it remained stationary. In each of these last 12 cases 
except Nos. 31, 37 and 38, the center of low barometer pas 
north of the United States, and it is doubtful whether the 
lowest barometer was observed. Thus we see that in the 
American cases, the storms generally increased in intensity, 
while in the European cases there was a slight diminution of 
intensity. : 
The highest wind recorded at any station during the days 2 
question (excluding Mt. Washington and Pike’s Peak) ranged 
