18 KE Loomis—Observations of the U. S. Signal Service. 
Quebec ; in the case of seventy-seven the pressure at Kings- 
ton was only ‘02 inch greater than at Portland ; and in seventy: 
eight the pressure at Albany was only ‘05 inch greater than at 
Atlantic City; so that it appears not improbable that at the 
height of 6,000 feet the center of least pressure at each 
these four dates was west of Mount Washington. In eachof | 
these cases there was a center of high pressure in a direction — 
west or southwest from Mount Washington and at an average — 
distance of 1,100 miles. It is presumed there was also an 
area of high pressure on the east side of Mount Washington, — 
but it had already passed beyond our stations of observation. _ 
With a southeast wind of fifty-four miles per hour on Mount 
Washington the low center falls between the directions south | 
and northwest. The only exception is No. 80 and this case | 
seems to indicate that at the height of 6,000 feet the low center | 
was nearly two hundred miles in arrears of the low center at 
the surface of the earth. In each of these cases there was an | 
area of high pressure west or southwest of Mount Washington. — 
Generally its direction was nearly west and its distance about — 
1,200 miles. The center of high pressure on the east side had 
generally passed beyond our stations of observation, but in the 
ease of No. 91, the pressure at Cape Rozier was 30°67 inches, — 
and the distance of the center of low pressure was more than | 
exceptions are Nos. 93, 94, 97 and 103. In the case of Nos. 
93 and 97, observations at other stations place the low center 
considerably south of Oswego and Grand Haven; and in the 
ease of No. 103, observations at other stations place the low — 
center west of Portland. The position of the areas of high 
pressure is nearly the same as for the southeast winds. 
With a northeast wind of fifty miles per hour the low center 
is generally found south or southeast of Mount Washington. | 
The exceptions are Nos. 109, 110, 111 and 117. In the case. | 
of Nos. 109 and 117 no observations were made near the [ 
Atlantic coast at any station east of Portland, and it is proba- F 
ble that at these dates the low center was not far from Halifax. | 
In the ease of Nos. 110 and 111 the low center came from the | 
station of observation. 4 
he examination of these one hundred and twenty-one cases [| 
