308 



H. Arctowski — About Climatical Variations. 



The consecutive temperature curve of Arequipa, for the years 

 1900-1910, shows 4 characteristic crests and 1 depressions (fig. 1). 

 The curve of Bulawayo, in Rhodesia, is absolutely similar to the 

 Arequipa curve. The same may be said about the curve obtained 

 from the Mauritius Observatory figures. The same Tananarive 

 on Madagascar. Batavia, in Java, displays also an indisputable 

 resemblance to the Arequipa curve. North of the equator, Hav- 

 ana gives a similar curve, whereas the data of San Juan, Porto 



Fig. 1. 



Fig. 1. Curve of the consecutive annual temperatures observed at Are- 

 quipa. A, B, C, D : pleionian crests. The meionian depression b. may have 

 been accentuated by the effect of volcanic dust produced by the Mt. Pele erup- 

 tions or by other causes. The curves connecting the crests and the depres- 

 sions demonstrate the existence of a long range variation different from 

 the sunspot frequency variation. 



Rico, give a slightly retarded curve. This is a most interest- 

 ing fact because the pleionian crests of Porto Rico could not 

 be retarded if these temperature anomalies did not have a 

 tendency to persist, combined with a tendency of displacement. 



Considering, for the same period of years, consecutive 

 curves for a great number of stations of temperate or even 

 arctic regions, I found that the phenomenon of pleionian vari- 

 ations is less complicated than, would be expected, if we only 

 admit that it is a dynamical phenomenon. 



The pleions displace themselves as waves. But, as the 

 variations of Havana, Bulawayo, Mauritius, Batavia, etc., are 

 nearly simultaneous, one would be inclined to think that 

 the displacements of pleions go from the equatorial regions 

 towards the poles. 



