123 
or so irregular, as not to be immediately referable to any 
well-defined law. These points on the surface of the earth 
may be regarded as nodal points in the general system of 
circulation of the great currents of the atmosphere. 
Among the places at which it seemed to me likely that 
the law of change in the relative amounts of rainfall under 
different winds would be found to differ considerably from 
that which prevails at Oxford is St. Petersburg. I there- 
fore extracted from the volumes of the Annales de I’Obser- 
vutoire Physique Central de Russie the amounts of rain 
which fell under different winds at St. Petersburg during 
the eleven years 1854-64. The results are shown in the 
following table : — 
Rainfall under different Winds, at St. Petersburg, 
during a Solar Spot Period. 
N. 
N.W. 
W. 
S.W. 
S. 
S.E. 
E. 
N.E. 
Calm. 
In. 
In. 
In. 
In. 
In. 
In. 
In. 
Iu. 
In. 
1854 
o-soo 
0-675 
3-543 
2-101 
1-088 
0-776 
1-041 
1-087 
1-644 
1855 
2-056 
2-688 
1-192 
3-688 
1-720 
0-558 
1-509 
0-961 
1-325 
1850 
0313 
1-014 
5-174 
2-331 
1-386 
1-551 
0-535 
1-852 
0-800 
1857 
1-871 
o-ooo 
2-700 
1640 
1-223 
0-757 
0-181 
2-618 
1-856 
1858 
0-213 
0-445 
2-218 
2-441 
0-475 
2759 
1-025 
1-075 
1-002 
1859 
0 375 
0-548 
4-961 
4-371 
2-329 
2-251 
1-038 
0-618 
0-639 
1860 
1-400 
1-182 
2-194 
3-088 
1-910 
2-460 
2-469 
0 301 
0-683 
1861 
1-861 
0-123 
6-327 
2-681 
3*225 
2-259 
1-376 
0-978 
0-332 
1862 
1-045 
1-448 
3-290 
2-717 
2-032 
1-921 
0-497 
0-431 
0-368 
1863 
0-332 
2-446 
2-521 
3-390 
3-110 
1-984 
0-512 
0-831 
0-000 
1864 
2-171 
6-560 
3-038 
4-580 
2-017 
7-532 
1-201 
2-430 
0-656 
Means. 
1-131 
1-557 
3-378 
3-002 
1-865 
2-258 
1-035 
1-189 
0-846 
From the mean values in the last line of this table it 
appears that there was a principal maximum of rainfall 
under west winds, and a secondary maximum under south- 
east winds ; a principal minimum under east winds, and a 
secondary minimum under south winds. 
In the eleven years 1851-64 the number of groups of 
