ee a ae, ae 
a a 
E.. Loomis— Observations of the U. S. Signal Service. 7 
reached the Mississippi River, there are no mountain barriers 
to prevent the formation of a system of circulating winds over 
an area 2,000 miles in diameter. 
Areas of high barometer. 
Each of the areas of low barometer described in my eighth 
paper was preceded by an area of high barometer on the east 
side at an average distance of about 1,000 miles, and was fol- 
lowed by an area of high barometer on the west side at about 
the same distance. 
In order to discover the circumstances under which areas of 
siderable number of stations, all included within the same high 
area. In such cases, only one of the stations was employed, 
viz., the station at which the barometer was highest. ese 
cases of high barometer are exhibited in the following table, in 
which column Ist shows the number of the high area; column 
2d shows the date at which the barometer was above 80°65 
area; and column 10th shows the height of the baro 
