16 E. Loomis— Observations of the U. &. Signal Service. 
No. 28.—March 22.2, sta Ni Wit: ey Nz W..325 
Grand Haven, N. W. 3 ; Milwaukee, 'N.W.3 ; March 22. 3, 
Grand Haven, : a Rochester, N. Ww. ; Saugeen, 
N. W. 38; Toronto, N. W. 31; March 23. i, Aloe. iW, 
25; Semin N. W. 28; posmee N. W. 2 25; Saugeen, N. 
W. 27; Toronto, N. W. 25; March 23.2, Albany, N. W. 34; 
Oswego, N. W. 28; Toronto, N. W. 29 ; Montreal, N. W. 
at: Chive res N. W. 2 25; March 23.3, Burlington, N, W, 
40; Cape May, N Ww. 26; Father Point, N. W. 48; March 
24. 1, Eastport, N. 3 
. 20. — April AGA; Albany, N. W. 28; Burlington, N. 26; East- 
port, N. 28; April 12.2, Cape Rosier, N. 30; April 12.3 
N 
° 
Cape Rosier, . 82. 
No. 30.—Sept. 16.2, “Quebec, N. E. om Sept. 17.1, Quebec, N. E. 
4, Sept. 17.2, Quebec, N. E. 3 
No. 31.—Oct. 9.2, Bismark, 'N. W.3 os Fort Sully, N. oe Pem- 
bite Ww. WW, 28; Oct. 10. 2, Grand Haven, PW. 3 2; Oct. 
10.3, Parry Sound, 37. 
No, 32.—Oct. 28.1, Bismark, N. 34; cae 28.2, Cheyenne, N. Ww. 
40; Oct. 28. 8, Yankton, N. W. ; Breckenridge, N. 32 
Oct. 29.2, Yankton, N. W. aa ak, WiiAV. 87 5 Fort 
Sully, N. Ww. 32; Oct. 29.3, Wace Sully, N. W. 28; Quebec, 
N. 41; Oct. 30.1, Yankton, N.W. 28. 
In column 6th of the table on pages 8, 9 and 10 is shown the 
highest wind oS preceded each of these areas of high barom- 
eter. We see that these maximum velocities range from thirty 
to fifty-seven ates the average being thirty-nine miles per 
hour. About two-thirds of all these violent winds were from 
the northwest, and all but six were from some northern quar- 
ter. These winds will be seen represented on Plate ITI. 
The facts thus presented seem to confirm the conclusions 
stated in my eighth paper, and also to warrant some additional 
pidieatieaticns We see that immediately after a center of low 
pressure has passed, the wind generally sets in with considera- 
ble force from a northern quarter. By the earth’s rotation this 
northerly wind is deflected to the right, and thus is maintained 
a mechanical rarefaction of the air about the low center. The 
westward deflection of this current of air produces a mechani- 
eal apnea ct a the airon the western side, so that the same 
cause contributes to produce an area of low barometer on the 
east side and an area of high barometer on the west side, and 
the greater the force of this northerly wind, the greater will be 
the condensation of the air on the west side of the low area. 
Thus areas of unusually high barometer are in part the effect of 
the violent north winds which immediately precede them. 
These north winds come from a region “ation a wy low tem- 
rature, so that the air is condensed p by mechanical 
_ pressure, and partly by its low rina rie "These northerly 
ae Se asa eee ee ere a egress 
