74 Royal Society : — 



less weight. The inverse curve of the frequency of solar spots has 

 been formed by simply subtracting 100 from Wolf's numbers, and 

 laying down points to the scale of a number 4 to 0°*05 F., or one 

 division of the ruled paper. 



The broken curve represents the variations in the mean annual temperature 

 at the Cape ; the continuous line is the inverse curve of solar spots' frequency. 



The agreement between the curves appears to me so close that I 

 cannot but believe that the same cause which leads to an excess of 

 mean annual temperature leads equally to a dissipation of solar spots. 

 There is on the whole a curious appearance of lagging of the inverse 



