12 



E. Loomis — Contributions to Meteorology. 



The following table shows the average results deduced from the 

 observations of these five years. 



Bate of progress of Storm Centers in Europe. 



Kilom. Miles 

 In 24 h. p. hour 



January . 

 February 



March 



April 



May 



June 



673 

 694 

 676 

 626 

 569 

 609 



17-4 

 18-0 



17-5 

 16-2 

 14-7 

 15-8 



Storms. 



Ratio. 



in r. s. 





33-8 



1-94 



34-2 



1-90 



31-5 



1-80 



27-5 



1-70 



25-5 



1-73 



24-4 



1-54 



July 



August 



September 



October 



November 

 December. 



Kilom. Miles 

 in 24 h. p. hour. 



549 

 541 

 667 

 732 

 720 

 693 



14-2 

 14-0 

 17-3 

 19-0 

 18-6 

 17-9 



Year___ 646 16-7 28.2 1.69 



Storms, 

 iu V. S. 



24-6 

 22-6 

 24-7 

 27-6 

 29-9 

 33-4 



1-63 



1-41 

 1-47 

 1-53 

 1-60 

 1-87 



Column 2nd shows the velocity of movement for each month 

 expressed in kilometers for 24 hours; column 3d shows the 

 velocity expressed in English miles per hour: column 4th 

 shows the velocity of movement of storm centers for the United 

 States; and column 5th shows the ratio of the numbers in 

 columns 3 and 4. 



We see that in the United States the average velocity of 

 movement for the entire year is about two-thirds greater than 

 it is in Europe. This ratio is greatest in winter when it 

 amounts to 1/9 ; and least in the autumn when it amounts to 

 1-5. 



The following table shows, in miles per hour, the average 

 rate of progress of storm centers over the Atlantic Ocean, as de- 

 duced from the monthly charts of storm tracks published with 

 the International Bulletin for a period of four years from 1879 

 to 1882. 



Jan. 



Feb. 



March. 



April. 



May. 



T 

 June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



17-4 



19-5 



19-7 



194 



16-6 



17-5 



15-8 



16-3 



17-2 



18-7 



20-0 



18-3 



The average velocity for the entire year is 18 miles per hour. 



If now we compare the preceding results with those hereto- 

 fore found for the West India cyclones while pursuing a wester- 

 ly course, and for the cyclones of the Bay of Bengal and China 

 Sea for the same part of their course, we shall have a view of 

 the movement of storm areas under a great variety of condi- 

 tions. If we compare the average results for these five districts 

 for the entire year, the numbers are as follows : 



United States 28'4 miles per hour. 



Middle latitudes of Atlantic Ocean 18-0 " " 



Europe 16-7 " " 



West India cyclones 13-7 '• " 



Bay of Bengal and China Sea 8-4 " " 



Thus we see that the average rate of progress of storm cen- 

 ters over the Atlantic Ocean is about the same as over Europe, 



