84 H. F. Blanford — Somefurtlier results of the sun-thermometer. 



The data, being those given in Table II, have been summarized in the 

 above Table to shew the mean variation, from year to year, in the following 

 manner. The differences of the corresponding months, in each pair of 

 consecutive years, being first taken out and tabulated, the sums of these 

 differences in the same pair of months and years is computed from as many 

 stations as are represented. These monthly sums and the number of stations 

 yielding them, in each case, are shewn in the table, and the annual sums 

 and means of the whole given at foot. 



If the first pair of years be rejected as furnishing insufficient data, the 

 table would seem to shew a continuous fall oE solar intensity ; rapid from 

 1876 to 1879, and subsequently only just appreciable. As is well-known, 

 the sun-spot minimum occurred in the 1st quarter of 1879, so that it can- 

 not be said that the present table shews a decided concomitance of the 

 solar intensity and sun-spot frequency such as resulted from the former 

 discussion. At the same time, if not conclusively favourable, still less is 

 it conclusively adverse to the former conclusion, and the enquiry appears 

 to be well worth following up with such further evidence as the Indian 

 registers may yield. This I propose to do. 



