Sun-spot Areas and Diurnal Temperature-Ranges. 311 



P 



H 

 5 



& 



S 

 o 

 O 



rO 



H 



os IN. co eq 



I> ^ Oi O5 



CM CO "5 "^ 

 00 O5 O (M 



to'cD-c" 

 (N (M (N 



