308 



Mr. R. H. Scott. The Variability of the [Mar. 27, 



These are obtained by arranging the changes, ^irrespective of sign, 

 according to their magnitude. Six subdivisions were made 0° — o, 9, 

 1°.0_ 4°-9, 5°-0— 9°-9, 10°-0— 14°-9, 15°-0— 19°-9, 20°'0— 24°-9. 



The first two of these subdivisions, taken together, cover the same 

 range of five degrees as any one of the others, but, inasmuch as by 

 far the greater number of changes were below 5 o, 0, it seemed to be 

 worth while to ascertain how many fell short of one degree. 



The total numbers were then divided by 15, the number of years, 

 so as to obtain the mean monthly number of changes in each sub- 

 division. The total of the figures for each month amounts to the 

 number of days in the month. 



It will be seen throughout the table how the range of changes is 

 least at the two Atlantic stations, Falmouth and Valencia. 



In every month and at every station the mean number of changes 

 between l o, and 4°'9 exceeds one-half of the number of days in the 

 month. At Valencia, in JuLj , the changes below l o, nearly equal 

 those between 1° and 4 0, 9, the figures being 14 0, 6 and 15°*9 respec- 

 tively. 



