( :m ) 



J 809) llms dhiaiiiiiiu' 27 i'csidnals. Tlic slalioiis were IIkmi auaiii 

 galInTcd iiilo ilic same ,ui'()ii|>s, (his linie only eiiiiit in ininiWer 

 (l>e(.*a.nse the ohserxalions lor llic West Indies \\ ei"e ('()ii«idci'(Ml loo 

 i]iC'onij)lele) and t'ov each ui-onp ilie 27 ni(\ui \alnes of llie residnals 

 were eonipnled. 



Tlie enr\'es rcprc^sciH inu' lliese mean residnals show lor each 

 of llie eiuiil <lislricls llie seenlar xarialions o(' alinospherie pi-essnre 

 in Ihal reuion. 



The eiuhl ('iir\('s certainly exhiliil many dilTerenees \\ hen eom|iared 

 to each otliei-; nevertheless in the nnmUer of their maxima and 

 miinma we ol)ser\e sneh an nnmistakahle sinnlarily, that it is 

 e\'ideid they are aetefl npon l)y a common iiillnence. the cosnnc 

 natnre of \\hicli is not donltll'nl. 



Sinnlar charts have heen framed hy Lockvi'.k and Ity l>i(;i:i,()\\ for 

 other parts of the Lilolie and compared with the cni'\ c of pronniience 

 i'recpiency. They resnited in the conclnsion that an nndeinalde relation 

 exists hetwcen these phenomena. 



Ilowcxcr, to lind this i-elation i-> not siudi a simple matter. In 

 some r(\iii()]is of the Martli the maxima of |)rominence frecpiency 

 coincide w itli the maxima ol' atmospheric pressnre (lionihay, Kata\ ia, 

 Perth, Adelaide, Sidney), in others on the contrary with the minima 

 (('ordoha, Mohile, .lacksonx ille, I'eiisacola, San l)iefi,o), whilst cdse- 

 where auaiii the maxima are shifted. althoiiLih the u-eiieral character 

 of the ciir\'es persists. 



As yet the haromef rical observations nnderlaken in elncidatiou 

 of this (piestion are conlined to too small a nnmher ol" places to 

 allow of Li'eneral coiiclnsions lieiiiu' drawn frinii the data collected, 

 it is tliei'(dore niider reser\ation that we emit the Ibllowinii' hypo- 

 thesis as a gnide foi' further iii\'esti<ialion. 



At ])eri()(ls of maximnm pi'omijience fre(|nency the 

 atmospli(M-ic circulation is intensified o \v i ii u- to the 

 i r r e <>■ u 1 a r i 1 i e s of the sol a r r a d i a t i o Ji field. T his causes 

 a decrease of the mean harometric [>ressnre at all those 

 places, where the eJi ha need circnlation causes an excess 

 of humidity, whilst at j) laces where this is i/ot the 

 case, the mean atmospheric pressure will be above 

 the 11 o r m a 1. 



8. Cosmic Inliuence on other terresii-ud plienomena. 

 If the Eartii moved through a perfectly regular radiation field, 

 there would be a certain normal atmospheric circulation, and in 

 connexion with this circnlation there would be at each place a (ixed 



