254 H. MOHN. METEOROLOGY. [NORW. POL. EXP. NO. n.] 



The accompanying diagram shows the position of the Fram in the differ- 

 ent seasons according to the above given tables. The heavy black lines 

 indicate the dark season or perpetual night, the parallel light lines the sunny 

 season or perpetual day, and the small circles the equinoctial months March 

 and September. The black circle shows the mean position for the dark 

 season, the open circle the same for the sunny season, and the circle with a 

 central point the same for the equinoctial months. The diagram shows at 

 a glance the distance of the track of the Fram from Terra firma. 



