1871.] Variation of Temperature at the Cape. 391 



laying down points to the scale of a number 4 to o, 05 F., or one division 

 of the ruled paper. 



1841 



1 IS4Z .'. 

 j 1843 . - . 





; — O — fo ! J> > •j-. Ci^J V D ( 

 . \ 



10+2 

 1343 



1344 * • 



' I Q • C 









lo-o . _ - - 



] : I&46 ; . • 







! t J 



1 B *G 











!pv '"'> : X''' 



~^>- 





1 3 47 









1349 









!85; ; 



:1355 , .. \ 

 j 18 54 . '" .. 





X " 



IS55 i 

 j g j"4 ; 



1356 









857 



1" 5-3 I 

 18 SQ 



1 1860 "---..^ 



v 



\ 





I860 ! 



is6i N/- ■> 







1361 



1 £ 62 . , - " ' \ 







(862 j 



ii}63 : . . - - 3 _ ' \ 







1863 1 



: 'l£64 ~ / 







1364 ! 









. 1865" i 

 i8G5 i 

 - -.1867 | 



; i8"S9 - 







■ 1363 

 1369 ! 



1.87c 



1 : i . 1 I 1 \ j 



i u:'sf J> (A^^ro -O - fo U -f. 



,11111! 



o. Ci ■ i to p 5 — _ opNl O (-1 ^ in r 



i 



1S70 j 



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 curve of solar spots 

 over that of temperature. At the maximum about 1856, however, this 

 does not appear to be the case ; but when the uncertainties of the data, 



