NO. 4 TEMPERATURE VARIATIONS IN THE NORTH ATLANTIC 203 



agree completely with the other curves but shows in several time 

 intervals of many years a close agreement. Occasionally, however, 

 it goes oppositely; It fo'rms plainly a mixed form between the two 

 types of curves, in the same way as the curve for the interior states 

 of North America. This is also as we should expect following 

 Hildebrandsson, since this curve should agree with the curve for 

 middle Europe, which is a mixed form between the curves for north 

 Europe and those for south Europe. The south European curve 

 should furthermore, according to Hildebrandsson, agree with the 

 curve for the Pacific coasts. 



SUDDEN DISCONTINUITIES IN THE AGREEMENT BETWEEN THE 

 CURVES OF DIFFERENT STATIONS 



If we compare the curves of figure 75 for Batavia and the Ameri- 

 can region, we see that the variations in the Atlantic states and 

 Batavia ran parallel in the period of time after 1897. In the earlier 

 years, however, the two curves go in inverted directions, and the 

 variations at Batavia correspond to the variations on the Pacific 

 coast. As we have already remarked, the variations in Batavia 

 and at Bombay go oppositely to one another in' the time interval 

 1900 to 1909, but not, however, for the time 1880 to 1889 (see fig. 71, 

 Vlll-a and b). Except for the Arctowski curves for the above 

 mentioned time interval we have not had opportunity to study the 

 temperature relations in Bombay by similar twelve-monthly smooth- 

 ing as we have done for Batavia. In order to make a comparison 

 for the earlier years between the temperature variations in Bom- 

 bay and in Batavia we have therefore been obliged for the present to 

 restrict ourselves to the yearly means of temperature which are found 

 in Mielke's plates, and from them we have constructed curve IV 

 in figure 91. From this one sees that the two temperature curves 

 III and IV ran oppositely after 1897, but parallel before that time. 



The opposition between the types for Batavia and Bombay holds 

 only for the last series of years after 1897 and not for the 

 earlier years. A somewhat similar relation holds as between the 

 curves for Batavia and the Pacific states. It is moreover possible 

 that the same thing occurs for the temperature variations at several 

 other stations where the curves for the last time interval after 1900 

 follow an opposing course. The conclusion may therefore be drawn 

 that a given station does not always continue within the same 

 climatic region or action center, for the boundaries of it are more 

 or less displaced and often over a long series of years, so that in 



