CONNEXION OF CYCLONES AND RAINFALL WITH SUN-SPOTS. 22] 
Table I[V., which contains a list of Bourbon (Réunion) hurricanes and gales 
from 1733 to 1754, gives the following results :— 
Number of Number of 
Max. Years. Hurricanes, Min. Years, Hurricanes, 
GOGH * iv cthelaetne « « « 7 Sanaa Wii via y 
1737 ais 2 aos alae «Siete ce 1 
ESS). x Ste gis datas fh 1/27 Se Se Bayete 1 
WZ BO). evareiaietes AE 2 AD). cds ocisiPaicornat L 
L740, .homeeeeedes oO Ly 2 ee ares a 
TS) OA ene ep een nd SE Ele 0c deia saves 4 aces ee 3 
THO} ao eae AOA bad ecceimasa sist 
17.6) Gee ie 1 —— 
EON Ay ee oid ans eter 2 Total . 11 
Totall.... 18 
For the two islands the number of cyclones in the maxima years was 
thirty-six, and for the minima years nineteen. This result is favourable. 
It would appear also from Mr. Poey’s researches, and from investigations 
made at Mauritius in 1872, that the cyclones of the West Indies are, upon 
the whole, subject to the same periodicity. 
The rainfall for the twelve years under discussion is given in Tables V. 
to IX. 
Taking the mean annual rainfall at thirty stations in Scotland, thirty-one 
stations on the continent of Europe, and the annual falls at Greenwich, Cal- 
cutta, Bombay, Mauritius, and the Cape, we get :— 
Continent 
Years. 12 reread cag of Europe, |Calcutta. | Bombay.| Mauritius. ty A Sums. 
stations.) wich. | 9) <tations, . Hope. 
1856.| 37°6 21-9 24:8 64:2 65:9 46:2 21:9 | 282°5 
1857.| 36:0 21°4 21:2 69-0 51:3 43-4 22°7 | 265-0 
1858.) 37-4 178 22°6 59°8 62°4 35°5 241 | 259°6 
1859.| 408 25:9 25-7 68:7 772 56-9 36-7 | 881-9 
1860.| 39:9 32:0 27°5 52°6 62:1 45:1 29:1 | 288°3 
1861.} 45°83 20°4 23:7 89:1 769 68-7 25:4 | 349-5 
1862.| 466 26°5 26:3 73:4 73°6 28°4. 32:0 | 306°8 
1863.|  42°6 19°8 24-6 61-1 77°7 334 25°6 | 284'8 
1864.; 40:0 169 239 84:2 456 24] 18:9 | 253°6 
1865. 35°7 28:7 23-4 616 778 44-7 18°7 | 290°5 
1866.| 447 30°7 26°8 65°7 784 20°6 19:2 | 286-1 
1867.) 41:5 28°4 29:1 76:7 62:3 36:0 23:0 | 297-0 
It appears from the rainfall at sixty-seven stations that the maximum fall 
was in the years 1859 to 1862, and the minimum in the years 1857, 1858, 
and 1864, We thus find a certain degree of correspondence between the 
cyclone and rainfall fluctuations; and it is possible that if we had returns 
from America, the correspondence would be much greater; for it would 
appear from researches by Mr. G. M. Dawson that the level of the American 
great lakes was considerably less in 1866-68 than in 1859-61*. 
A large number of additional rainfall returns has been received from 
Europe and other parts of the world; and the results, which will be com- 
municated in another Report, afford fresh evidence of a Rainfall Periodicity. 
* The year 1867 has been almost the only exception to the rule, in Europe, since the 
commencement of the century; and as most of the stations are in that part of the world, 
the results for 1856-67 are not so favourable as for previous cycles. 
