CYCLONES AND ANTICYCLONES. 
129 
tides from other points would take a like path, so that 
the atmosphere would flow about the storm center 
from right to left. 'No doubt it is partly due to an¬ 
other influence : the low-pressure area is several hun¬ 
dred miles in diameter, and the south¬ 
ern side would therefore be percepti¬ 
bly warmer than the northern side. 
As the warmer air flows toward the 
center from the southern side it meets 
cooler currents. This results in the 
condensation of its moisture, and 
tends to diminish the pressure, while 
on the north side the cooler meets 
the warmer air, resulting in “ clearing 
up.” As the air in the southern part 
of the region would yield more readi¬ 
ly to the eastward current than that 
on the north side, rotation in the 
direction stated is started. Rotation 
once started is kept up by its own 
inertia. 
As the atmosphere north of the 
horse latitudes has the general east¬ 
ward motion, it carries these storm 
centers with it. In the United States they come off 
the Paciflc and enter the continent in the neighbor¬ 
hood of British Columbia, and after reaching the in¬ 
terior they bend slightly to the northeast, entering 
the Atlantic through the valley of the St. Lawrence. 
Sometimes, it is true, they are broken up or deflected 
somewhat from this course. 
storm center; P 
a particle of air 
moving toward 
it, but by rota¬ 
ting influence is 
carried into the 
curved path 1 
£ 3450 . 
(From About 
the Weather.) 
