1887.] H. F. Blanford — Influence of Indian Forests on the Rainfall. 7 



The data for this comparison are afforded by the following table 

 which exhibits, in the second column, the mean rainfall of the 14 stations, 

 enumerated in the A list of the previous table, in each year from 

 1867 to 1885. The third column gives what may be termed progres- 

 sive averages. Each average is that of 5 years, obtained by the formula? 



c, = 



-\- 4<b + 6 c + 4id -\- 

 16 



wherein a, h, c, d, e, represent the mean rainfall in any five conce- 

 cutive years and c, the progressive average for the third year of the series. 

 As a standard of comparison, I give, in the fourth column, the average 

 rainfall of the whole Indian area (with the omission of unrepresented 

 tracts). The average rainfall is taken at 42 inches. Lastly, the fifth 

 column shews the progressive averages of the rainfall of India computed 

 from column four. 



Comparative Tahle of the Mean Annual Rainfall of the Forest Region it 

 the Central Provinces and of India from 1867 to 1885. 





Condition. 



Central Provinces. 



India . 



Year. 



Annual 

 mean 



Inches. 



Progressive 

 average. 



Inches. 



Annual 

 mean. 



Inches. 



Progressive 

 average. 



Inches. 



1867 

 68 

 69 

 70 

 71 

 72 

 73 

 74 

 75 

 76 

 77 

 78 

 79 

 80 

 81 

 82 

 83 

 84 

 85 



C3 



a 

 P 



X 



1 



1 



55-08 

 33-59 

 47-97 

 50-42 

 45-52 

 53-31 

 39-18 

 50-48 

 56-60 

 42-32 

 52-50 

 52-47 

 55-67 

 51-83 

 57-90 

 54-22 

 57-73 

 64-63 

 57-43 



45-28 

 47-71 

 48-45 

 47-47 

 47-02 

 48-85 

 50-15 

 49-58 

 50-40 

 52-60 

 53-85 

 54-50 

 55-31 

 56-52 

 58-57 



44-8 

 35-4 

 42-4 

 43-5 

 42-9 

 44-3 

 37-5 

 46-6 

 44-4 

 37-5 

 37-7 

 48-3 

 43-7 

 40-4 

 42-1 

 44-6 

 41-9 

 43-7 

 43-1 



40-2 

 40-3 

 41-0 

 42-6 

 43-0 

 41-7 

 42-2 

 42-4 

 42-4 

 40-5 

 41-1 

 43-3 

 43-5 

 42-4 

 42-4 

 43-0 

 431 



