G8 ANNALS NEW YORK ACADEMY OF SCIENCES 



Naturally one asks whether the antipleiuii of 1900 went down or the 

 pleion went up. The consecutive curves will orive some indication about 

 the displacement which took place: The j)lci()iiiiiii crest passed Kasan at 

 the consecutive mean: Sept. 1900-Aug. IIMH. In lTa))aranda, Bodo 

 and Sydvaranger the crest occurs at the mean of Nov. 1900-Oct. 1901. 

 In Vestervig and Aachen, Feb. 1901-M^rch 1902. 



We must admit therefore that, most pr(?bably, the displacement went 

 from northeast to southwest, but the map shows the existence of an 

 antipleion over the White Sea. Moreover, in 1901, the consecutive curve 

 of Kazan is on the descent. The same is true in northern Scandinavia. 

 If we consider the dates of the occurrence of the minimum, we find: 

 Sydvaranger, Maparanda, Bodo, November, 1901-October, 1902 ; Kazan, 

 1902; Vestervig, Warsaw, Bucarest, February, 1902-January, 1903; 

 Geneva, May, 1902-April, 1903. There is, therefore, a progressive in- 

 vasion of a negative wave coming from the White Sea and spreading out 

 towards the southwest and south. The map of 1902 shows plainly the 

 importance of this antipleion. 



This characteristic antipleion, with a departure of — 3.1 at its center in 

 Mezen, follows closely the first depression of Arequipa. Therefore, a de- 

 tailed study of the meteorological phenomena of 1902 would be most 

 instructive if one took, besides the European data, those of Asiatic Russia 

 and India. The distribution of the equideparture lines on the map (Fig. 

 14) shows plainly the dynamical character of the phenomenon. 



It would not be veiy difficult to find out how this antipleion invaded 

 Europe and the reason why could be traced as well, and correlated with 

 the equatorial variation of temperature. 



The map (Fig. 15) of the departures for 1903 is just as interesting as 

 the map of 1902. There is an important rise of temperature over all the 

 area with the exception of southwestern Europe, Ireland and Scotland. 

 Now there is a pleion centered over Russia, where the departures are 

 -|- 1.5 in Pernau, Vologda and Vychnyi Volotchek. 



^Vhat became of the antipleion of 1902? Did it go towards the At- 

 lantic and the south, or was there a rise of temperature in situ without 

 any displacement? 



The consecutive curve of Geneva (Fig. 11) shows that the antipleion 

 of 1902 certainly did not cross Switzerland to go south ; but the curves 

 of Sydvaranger and Haparanda are very steep immediately after 1902, 

 the curve of Warsaw (Fig. 10) shows a regular and progressive ascent 

 from 1902 until 1903, while the curve of Bucarest, on the contrary, 

 shows a slow ascent followed by a very much faster increase of tempera- 

 ture towards the end, and there the values remain high till t]u> mean of 



