576 H. MOHN. METEOROLOGY. [NORW. POL. EXP. 



the year. By means of these figures, I have drawn the isabnormal lines and 

 copied them into the charts on Plates XVII XIX, and XX. The line for 

 is drawn more heavily than the others. The lines for positive thermal 

 anomaly are continuous, those for negative anomaly, dotted. 



It follows from the definition of the isabnormal lines, that the zero-line 

 must go through the Pole. In the vicinity of the Pole, the thermal anomaly 

 is small. 



The interior of Greenland has negative anomaly in all months. The 

 Norwegian Sea has upwards of -f- 25 in January and February. The great 

 continents have positive anomaly in summer (Siberia -}- 6), and negative 

 anomaly in winter (Siberia 25 in January). The region between Bering 

 Strait and the Pole has negative anomaly in all months, but generally less 

 than 5 degrees. 



To conclude I must remark that the results set forth in this chapter, and 

 drawn from the Fram-observations, may be modified in several ways by 

 future observations in the arctic regions. 



