16 EE. Loomis—Results derived from an examination of the 
ber of stations was seventy-two, but this number was gradually 
increased and in November, 1873, amounted to eighty-eight. 
Column 4th shows the height of the barometer at the nearest 
center of minimum pressure; column 5th shows the station at 
which the pressure given in column 4th was observed ; column 
6th shows the direction in which the low center had moved 
during the last eight hours, and column 7th shows the velocity 
with which it moved expressed in miles per hour. Column 
8th shows the total amount of rain observed within the area 
with very little rain. Of the 101 cases here mentioned, more 
there were at least thirty stations which showed a pressure 
below thirty inches; and in several cases there were over fifty 
stations which showed a pressure below thirty inches. The 
following table contains the most important examples. Column 
ist shows the number of reference from the preceding table 
and column 2nd shows the number of stations at which the 
twenty-four hours or longer. These barometric minima seldom 
continue stationary for eight hours, but almost invariably 
