ail 
_ is very remarkable. The lowest temperature observed ina 
E. Loomis— Observations of the U. S. Signal Service. 11 
Classification of the cases of high pressure. 
West of lon. 102°. From lon. 86” to lon. 102°. | East of lon. 86°. 
Station, Lat. ‘cases, Station. Lat. cases Station. Lat, \Gaele. 
Fort Benton |47°52’| 7 ||/Pembina 49° 07) 9 Iie Rosier |48°52’) 4 
Portland, Or. |45 30 1 ||Duluth 46 48 1 |/Father Point |48 31} 4 
Marquette 46 33 1 |\Chatham One be eee: 
Breckenridge 46 16 | 29 nebec 46 48; 1 
St. Paul a4 53 | 3 |\Sydney 46 8) 1 
Fort Sully 44 39 | 8 ||/Montreal 45 31] 2 
LaCrosse 3.48 156 na ae «gs aa 
Milwaukee 43 3 1 ||Halifax 44 39 | 3 
Yankton 42 45 | 13 rockville (44 31 2 
Chicago 41 52 | 2 |/Burlington (44 29| 2 
Davenport (41 30) 2 ingston 4412) 6 
maha 41 16 1. |/Portland, Me. /43 40 | 2 
Leavenworth |39 19 | 6 |/Port Stanley 42 40 2 
St.Louis  |38 37 | 1 ||Toledo 40 39| 
i 0 2 || Baltimore 39 18 i 
Nashville 36 10 | 2 |\Lynchburg (37 18; 1 
Fort Gibson (35 43 1 }| Norfolk 86 bhp 
his 8 | 2 |\Knoxville ab Gh. 8 
ugus 328) 2 
Charleston (32 45] 1 
The observations at each of these stations cover the entire 
period of twenty-six months, with the following —— viz., 
the observations at Pembina commenced in November, ;: 
those at Halifax, in Tics Whee 1872; at vankion and Fort 
Gibson, in April, 1873; at Chatham, i in October, 1873; at Cape 
Rosier, Father Point and Sydney, in November, 1873; and at 
Brockville, in January, 1874, We see that cases of high ba-_ 
rometer occur most frequently at the northern stations. About 
two-thirds of the whole number were north of latitude 44°, and 
only fifteen per cent of the whole number were south of latitude 
40°. Only one of the cases occurred beyond the Rocky Mount- 
ains ; and on the east side of the mountains high barometer is 
most frequent near the meridian 97°. After making allowance 
for the unequal period of observation at the different stations, 
we find sak in ‘he “aelaldeorhood of —— cases of very high 
pressur nearly twice as frequent as they are at a corres- 
ponding latitude near the atic: ine This fact appears 
we make the comparison for pressures as. 
high as 30-9 aaah: he the region between Sina co 86° and : S 
102° the barometer rose as high as 30-9 inches in fifteen cases, 
while only one such case occurred in the siete east of Tonsil 
86°, and none occurred in the district west of longitude 102°. 
, ally 2% 3: Pe Mes high 5 essurt 
o 
case was —36° Fahrenheit at LaCrosse. In seven senna t] 
