21 



and illustrated by Chart No. 9 which exhibits, relatively, the number of days on 

 which the velocity of the wind reached 20 miles per hour or over, from various 

 directions. The first diagram of Chart No. 10 shows the general course of the 

 movement, of the atmosphere for the year, and is constructed as follows. 

 Beginning at A a line is drawn representing in length and direction the sum of 

 all of the winds from the northwest; from the end of this line another is drawn 

 representing in the same manner the winds from the west and so on, finally 

 terminating at B. The dotted line from A to B may be said to represent in 

 direction and amount the resultant of the years movement. It indicates a total 

 distance of 11000 miles, or an average velocity of almost exactly 30 miles per day 

 from a point 27° West of North. The second diagram represents the total 

 number of miles of wind during each month of the year, without regard to 

 direction. 



While it would be useless to generalize to any extent upon the results of a 

 single year's observations of the movements of the atmosphere, yet these tables 

 and charts so unmistakably lead to the conclusions given above in regard to the 

 prevailing directions of the wind that it does not seem rash to venture the 

 prediction that future observations will only serve to verify them. 



