4.60 REPORT—1904. 
India is in excess of the normal for a year or so, that over South America is 
deficient or below normal. 
A study of this pressure variation for places widely scattered over the earth’s 
surface shows that the earth’s surface may be divided into two parts: one part 
behaving more or less like India, and the other like Cordoba. A classification of 
pressures of these two regions shows that a dividing line may be drawn round the 
earth, on the opposite sides of which barometric see-saws take place. 
As it seemed possible that the knowledge of this regular barometric see-saw 
would render possible forecasts for approaching seasons, its relation to rainfall 
was investigated. 
Since rainfall, generally speaking, accompanies low pressure, the inverted pressure 
curves were compared with the rainfall curves for several stations. The very close 
relationship between the rainfall and inverted pressure curves which was thus found 
to exist suggested that there was a possibility of forecasting wet and dry years. 
The problem becomes more difficult the further the equator is left behind and 
the poles approached, but it is thought that when further investigation has been 
made the behaviour of the pressure and consequently rainfall variations in these 
regions will be more completely known, 
5. The Kelation between Solar Physics and Meteorology. 
Sy Professor BirkELanp. : 
6. Experiments with Kites in the Mediterranean. 
By L. TetssereNc DE Bort. 
7. The Relation between the Minima and following Maxima of Sun-spots. 
By Aurrep ANGot, 
Professor Wolfer published some time ago'a revision and continuation of 
R, Wolf's table of relative numbers of sun-spots, so we have now, for every month 
or year, the mean intensity of sun-spots from 1749 to 1901, 
When working at that table in order to verify or find some periodicities I met 
with a relation that was not mentioned, so I presume it may be new. 
‘When the mean number of sun-spots during a year of minimum is wnder the 
average of all the minima, the value of the immediately following maximum is 
also under the average, and vice versd.’ 
This will be apparent from the following table, which gives the relative 
numbers of sun-spots (7°) during the years of minimum and the numbers (R) for 
the immediately following maxima, arranged according to the decreasing values of 
the minima. The numbers in brackets are the corresponding years :— 
r R 
11 [1766] 106 [1769] 
11 [1844] 124 [1848] 
10 [1784] 132 [1787] 
10 [1755] 86 [1761] 
9 [1833] 138 [1837] 
7 [1867] 139 [1870] 
7 [1775] 154 [1778] 
6 [1889] 85 [1893] 
tse is Hd 
3 [1878] 64 [1883] 
2 [1823] 71 = [1830] 
0 [1810] 46 [1816] 
Average 65 Average 99:2 
1 Astronom. Mittheil., No. 93. 
