32 



H. F. Blanford — On some recent Evidence of the 



[No. 1, 



Table IV. B. — Mean monthly and annual differences of maximum black- 



bulb temperatures. 



Months. 



January, 



February, 



March, 



April, 



May, 



June, 



July, 



August, 



September, 



October, 



November, 



December, 



Yearly sums, 

 Means, 



1868-9. 



5-0 

 10-8 

 b-1 

 4-2 

 4-0 

 3-9 

 2-8 

 8-0 

 3-3 

 0-7 

 2-5 

 1-3 



+ 41-6 

 + 3-5 



1869-70. 



— 



— 2 



+ 



+ 21 

 + 1 



1870-1. 



—11 

 — 



1871-2. 1872-3 



— 0-5 

 



+ 2-5 



+ 2-1 



— 2-2 



— 0-3 

 + 0-9 



— 0-2 



— 0-4 



— 2-9 



— 11 



— 3-3 



— 2-9 



—ll-o 

 — 0-9 



1873-4. 



— 4-7 



— 3-1 



— 3-2 



— 0-5 



— 0-5 



— 1-1 

 1-5 

 0-6 

 2-8 

 2-7 

 3-2 

 0-6 



2-9 

 0-2 



The results obtained by these four different methods, resting on two 

 distinct kinds of data, agree then, in shewing a very decided variation 

 of the incident solar heat ; a variation which, in the epoch of its maximum 

 approximately, its rapid rise before that maximum and slower decline 

 after it, agrees with the variation curve of the solar spots. Table III being 

 based on a far larger quantity of data than either of the others, probably 

 gives the most trustworthy results. The curve obtained from this table is 

 given in the adjoining figure. 



