72 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. "JO 



1900, an absolute minimum in the year 1898, as well as low tempera- 

 ture in the year 1902, exhibits great similarity with our February 

 curve for the most westerly 10° field at 60° to 69° west longitude, 

 as shown in figure 20, 60 to 69° W. Petersen's most westerly yearly 

 curve has also similarity with the February and March curve for 

 his station No. 12 and also with the February and March curve 

 for the mean value of his two most westerly stations, stations 11 

 and 12, as shown in figure 13, 11 and 12. 



189S ^^ 1900 



Figure 37. Liepe's stations I to 

 VIII. Curves for the anomalies of 

 the yearly temperatures computed 

 from September i of the previous 

 year to August 31 of the given year. 



Figure 2>^. Curves for the ancma- 

 Hes of the surface temperature. L. 

 St. 1 for Liepe's station, I for the 

 year (September to August) and for 

 February to March. P. St. I for 

 Petersen's station I for the year 

 (September to August) and for Feb- 

 ruary and March, 10° to 13° W., for 

 the two 2° fields between 10° and 

 14° west longitude and between 49° 

 and 50° north latitude, of our north- 

 erly course Channel to New York, 

 10° to 19° W. for the most north- 

 easterly 10° longitude field between 

 10° and 20° west longitude, 43° and 

 45° north latitude of the course Por- 

 tugal to the Azores. 



The mean value for all of Petersen's stations for February shows 

 similar variations with the corresponding mean value for all of 

 our fields between the English Channel and New York (see 

 fig. 29, I). 



Since Liepe's stations lie along the east side of the Atlantic Ocean 

 where the distance between the isotherms is great, one would ex- 

 pect that the yearly curves would exhibit a good correspondence 

 with the February and March curves for these stations. This 

 expectation is realized for the most part of the cases. In figure 37 



