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SMITHSONIAN MISCELLANEOUS COLLECTI.ONS 



VOL. 70 



2° longitude fields, hence we must suppose that in all probability our 

 results are more accurate than his. 



If we draw the curves for February and Alarch for Petersen's 

 individual stations or 1° fields, we see that these curves compared 

 with ours agree well in the eastern stations but not so well, especi- 

 ally for March, the further one goes toward the west. If we com- 

 pare the two series for the first and second decade groups for the 



im 99 mo i 



J898 99 1900 1 2 



Figure 13. Curves for the temperature anomalies for February and March 

 1898 to 1902 at Petersen's 2 by 2 stations by pairs (the full drawn lines) with 

 the anomaly curves for our 10° fields for February and March-April (dotted 

 lines) combined. 



years 1898 to 1902, where we both have observations, we find a very 

 good agreement between the curves of Petersen's most eastern field 

 station i, (that is between 12° and 13° west longitude and 49° and 

 50° north latitude) and those for our fields between 12° and 14° 

 west longitude and 49° and 50° north latitude. But for the fields 

 westward of this the agreement is less satisfying and becomes worse 

 the further towards the west one goes until west 41° the agreement 



