ON 5<UNSrOTS AND TEIIIIKSTIIIAL PHENOMENA. 



459 



Yenr 



IS17 

 ISIS 



ISI9 



1 SoO 

 IS.-. I 

 isr.L' 

 is:,;i 

 IS,-, I 

 1 s,-5 

 I x:,(\ 

 ls,-.7 



IH.-,H 



is,-.i» 

 I SCO 



)U".S Sut1-|M)t 



NimibiTs 



Ml 



i"niuiiii 



Miiiiimuii 



Maxiimmi 



Year 



18(51 

 18(12 



ixc.t 



1 SC,-) 

 lH(i(> 

 lH(i7 



isds 



1 S(i'.» 

 IS 70 

 1871 

 1872 

 I87;i 



Nuillbrr lit' 



Cyclones 



11 

 JO 



il 



") 



7 



8 



r> 

 7 



!) 

 11 

 11 



\:\ 



12 



\\'(llt".S .SuUHl)llt 



Nil 111 ben 



77-7 

 (il-O 



•»'>'2 

 !U-4 



il'7 

 S'S Miuiiuuiii 



:i(i8 



7H-(> 



i:t1'8 Jlaximiim 

 li:!-8 



'••'.i 7 



07 7 



Pooy lias ill vest i;^M toil in a sirnilar iiiiinncr ilio cjcIdiu's In tlio West 

 Indies, and his results arc favourable to !MeUli'um's cuiielnsioii. 



Wealso possess a larj^e number uf reductions oi" strength and direction 

 of Aviiid on liiiid. Tliese, on the wliole, seem t<j show thiit intensity is 

 stronger at times of niiixinia snnspots, but the eonneution is by no means 

 certain. 



J^(i.hij'iiU. 



The investigations of the amount of rainfall are very numerous. They 

 have gimerally but not uniformly led to tlie result that the fall is greater 

 in years of many spots, but tlie reductions are often subject to the 

 criticisms -which wo have discussed, and I must therefore refer thoso wha 

 take an interest in the subject to the original jiapers. 



J 



Hall. 



It is remarkable that the hailfall statistics have led to a much more 

 decided result than the investigations on rainfall. Wo owe to Fritz some 

 extensive investigations on the subject ; instead of giving his tables, it 

 will be better to plot down his results so as to obtain curves of hail- 

 stone frerpiency. Curve 1 (Plate II 1.) gives the sunspot curve ; curves t2, 8, 

 and 4 give that of hailstone frerpiency. Tn curve 2, live yearly means 

 of observations taken at Milan, Udine, Vienna, and Prague are coml)in,ed. 

 Curve 3 represents similar means of observations taken at Stuttgart, 

 Bremen, Basle. In curve -I the observations of Cuba, Stuttgart, 

 Bremen, Chiswick and London, Boston, Providence, are taken into 

 account. A few series of observations which wc possess from last century 

 are decidedly favourable to the same conclusion. The connection between 

 suuspots and hailfall is fairly well established. 



Clouds. 



Humboldt supposed that there exists a curious connection between 

 the aurora borealis and the clouds which are known under tlie name of 

 cirrus or cirro-stratus. Though Humboldt's view has not been proved, 

 there is yet a greal deal to be said in its support. It becomes interesting, 



