NO. 4 TEMPERATURE VARIATIONS IN THE NORTH ATLANTIC 205 



this series of years an inversion o'f the variations occurs at the given 

 station. This happens, as Hildebrandsson has rightly claimed, at 

 stations which are on the boundary between two action centers, as 

 for example in middle Europe and interior America, but the boun- 

 dary displacements can obviously at times be so great as to bring 

 in places which at other times have very well-marked type characters. 



VARIATIONS IN DIFFERENT METEOROLOGICAL ELEMENTS 



Before we go farther in our consideration of the temperature and 

 its variations we will say a few words on the variations in other 

 meteorological elements, as these have come within our investiga- 

 tions and are shown on figure 71. 



As for precipitation, we have outside of Batavia the twelve- 

 monthly consecutive means only for Antananarivo on Madagascar 

 and for Fort de France in the West Indies (curves P.). As re- 

 gards Antananarivo, there are here no well-marked agreements 

 between the variations in the air temperature and the variations in 

 precipitation. The latter seems generally to run oppositely to the 

 variations in the air pressure.^ In Fort de France there is also 

 no well-marked agreement between the variations in precipitation 

 and the variations in temperature, although on the other hand the 

 curve for the precipitation goes pretty well with the air pressure. 



As for the cloudiness we have only the twelve-monthly consecu- 

 tive means (fig. 71, IV, N) for Antananarivo, except those for 

 Batavia given in figure 68. It appears from these that the cloudi- 

 ness has a certain tendency to vary oppositely to the temperature. 

 The scale of cloudiness is given in the figure with increasing values 

 downwards. We find, in other words, the same relation that we 

 found for Batavia, but less well marked. 



As regards Batavia, we found a complete agreement between 

 the variations in the daily temperature amplitude and the variations 

 in other meteorological elements. A similar investigation with 

 twelve-monthly consecutive means has been made for other tropi- 

 cal stations and the result is given in the curves T-A in figure 71. 

 On the whole there is here no well marked agreement between these 

 curves and the temperature curves. At single stations, Port au 

 Prince and partly at Mauritius there is an agreement with the 

 curve for the air pressure. 



We will now consider somewhat more at length the variations 

 in air pressure which are shown in curves in figure 71. As already 



^ Take notice that the curves for precipitation (P) are drawn inverted. 



