On the earth-currents and the electrical cur- 



rents in the atmosphere and their relations 



to the earth-magnetism. 



Luminous phonomena, natural and artificial, of the 

 nature of the polarlight 



by Selim Lemström. 



Introduction. 



In the spring of the year 1898 was published the Vol. 

 III of ,,Explorations internationelles des regions polaires 1882 

 — 83 and 1883 — 84. Expedition polaire Finlandaise, Sta- 

 tions de Sodankylä and de Kultala. The publication has 

 been delayed by a long illness which befell the author af- 

 ter the expedition was finished and the two first volumes 

 printed. It contains four parts: 



l:o Electriäté atmosphérique, 



2:o Courants telluriques, 



3:o Courant électrique de V atmosphere and 



4:o Phénoménes lumineux de Vaurore boréale naturels 

 et artificiels. 



It contains further 14 plates with curves, representing 

 the variations, during 2 days of every month, with obser- 

 vations every 5th minute of the 3 magnetic elements and 

 of the earth-currents in S — N and E — W directions, from 

 September 1882 till the end of August 1883, the earth-cur- 



