Addendum to Zone No. 7.-Continued.

103(a). Observations at the Central Physical Observatory of St. Petersburg, Russia, with a selfregistering anemometer of Adie. Year 1871. Published in the "Annalen des Physikalischen Observatoriums," 1871.

No. of

obs.

RELATIVE PREVALENCE AND FORCE OF WINDS FROM THE DIFFERENT POINTS OF THE COMPASS.

North.

2.4 5 3.3

10 3.4

May
June

12

July

135(a).

Jenisseisk.

August
September

October
November
December

0

29363oma

3.3 14 3.1

3.2 12 3.0

6442392

3.5

25

3.1

4.0

9 2.4 28

3.2 20 3.4 10 3.1 18

2.6

14

96

8 3.5 20 4.1 21 2.7 11 3 2.7 27 3.5 4 2.0 15 4.2 12 3.8 27

3.0

4 2.0 15

7 2.3

10

2.2 23 2.7

7 2.3 19

08041559

2.7 17 3.3 14 2.9 10 2.8 10 2.8
2
2 3.0
3.0
2.7 6 4.3
2.9 22 3.9

ZONE No. 8.

LATITUDE 50° To 55° NORTH.

The data for the study of the winds of this zone consist of observations made at 218 different places on land, for an aggregate period of not less than 1174 years, probably over 1200 years, and for nearly 30 years at sea, viz., 9327 days on the Pacific Ocean, and 1533 on the Atlantic. The places on land are distributed as

Computed from observations made at Iluluk, from the year 1825 to 1834 inclusive (old style), except the months of May, June, July, August and September, 1827, the last half of 1829, and 160 observations in the first half; and published in the Report of the United States Coast Survey for 1867.

Unalaska. Observed by C. P. Fish, six times a day, from June 1 to August 3, 1872, and contained in the Annual Report of the Chief Signal Officer U. S. A. for 1873.

Computed from observations, for an aggregate period of over 25 years, collected and classified, from the logs of numerous sailing vessels, at the United States Naval Observatory, under the direction of Capt. M. F. Maury, Superintendent.

4. Longitude 155° to 165° W.

N. W.

N. N. W.

variable.

Calm or

Spring
Summer

20 60 11 45 11 33 21 70 17 98 46 39 33 101 2 85 21 S. 83° 37′ W.
15 35 12 113 47 106 46 96 39 121 71 160 50 94 17 47 40 S. 16 51 W.

Summer

69 19 7 9 5 9 20 50 11 36 46 83 22 125 118 222 25 N. 54 24 W. .51

292

Number of days.

Observed at Fort Tongass, for an aggregate period of 21 months, in the years 1867, 1868 and 1869, by the Post Surgeon.

Fort a la Corne, by Lawrence Clark, Jr., during the months of November and December, 1864. Red River Settlement, by Donald Gunn, for an aggregate period of over five years, in the years 1844, and 1855 to 1861 inclusive.

Moose Factory, by J. Mackenzie, for an aggregate period of over 17 months, in the years 1861 and 1862.