148 MR. J. BAXENDELL ON THE ST. -PETERSBURG 



I therefore divided the series of rainfall-results into two 

 corresponding series ; and taking the means of the amounts 

 under each wind, I obtained the following numbers : — 



Mean annual Mean annual 

 amount of rainfall, amount of rainfall, 



1858-62. 1854-57 an d 1863-64. Difference, 



in. in. in. 



N °'979 1 "2-57 —0*278 



N.W °749 2*230 —1*481 



W 3798 3'Q28 +0*770 



S.W 3'°59 2*955 +0*104 



S i-994 1757 +0*237 



S.E 2*330 2*198 +0*132 



E 1*281 0*830 +0*451 



N.E 0681 1*613 —0*932 



C 0*605 ro 47 —0*442 



The differences in the last column show that the mean 

 amounts of rainfall under west, south-west, south, south- 

 east, and east winds are greater in years of maximum 

 solar-spot frequency than in years of minimum, while the 

 amounts under north-east, north, and north-west winds, 

 and calms, are less. Comparing, then, the total amounts 

 which fell under west, south-west, south, south-east, and 

 east winds in each year with those which fell under north- 

 east, north, and north-west winds, and in calms, we have 

 the following results : — 



Total amounts of Total amounts of Groups 



rainfall under rainfall under of 



W., S.W., S., S.E., N.E.,N.,&N.W. Corrected solar 



and E. winds. winds and calms. Ratios. ratios. spots. 



in. in. 



1854 8*552 4*026 2*03 



1855 8*697 7*030 1*23 2*00 79 



1856 10*977 3-979 275 1*67 34 



1857 6*501 6*245 I%0 4 2 '34 98 



1858 8918 2 735 3*22 371 188 



1859 I 4*95° 2*180 6*86 4*49 205. 



i860 12*121 3*566 3*39 5*00 211 



1861 15*868 3' 2 94 476 3*77 204 



1862 i°*457 3*292 3*17 3*71 160 



1863 n'5 I 7 3*609 3*19 2*64 124 



1864 18*368 ii*8i6 1*55 



