ARCTOWSKI, CHANGES IN DISTRIBUTION OF TEMPERATURE 113 



ing differences of temperature in Arequipa, one arrives at the conclusion 

 that a difference of 1° F. corresponds to a change of 0.01 of the solar 

 constant. 



It would be premature to conclude that the brachypleionian, the 

 pleionian and macropleionian variations are simply due to corresponding 

 variations of the solar constant. Other factors may indeed complicate 

 the phenomenon. Further research into the variations of the climates of 

 Asia, South Africa and Australia, in particular, must be made before 

 any definite conclusions can be reached. It is also evident that the sea- 

 sonal changes of temperature, atmospheric pressure and rainfall have to 

 be taken into consideration. I intend to do this. 



In this paper, I have sliown that in far distant regions of the globe, 

 simultaneously with the appearance of the Arequipa crests, pleions are 

 formed ; that these pleions have a tendency to persist ; that, in order to 

 persist, one must displace another. Pleions and antipleions are corre- 

 lated : if one moves, the other moves. In North America the displace- 

 ments seem to be confined to the jSTorth American continent. In conse- 

 quence, the pleions must pendulate from one side to the other. More- 

 over, the differences between the pleionian crests and the antipleionian 

 depressions of temperature change. These changes of amplitude seem to 

 be in immediate correlation with the equatorial changes of temperature. 



The Arequipa curve may, therefore, be considered as a very convenient 

 standard for the study of all the complicated phenomena of climatic 

 variations, and of those observed in North America in particular. 



It appears now perfectly evident that a more detailed study of the 

 Arequipa variations will advance very greatly the problem of correlations 

 between solar and terrestrial phenomena. 



