24 A. BLYTT. ON VARIATION OF CLIMATE. [No. 8. 1886.] 



in the cUmate ivill not simultaneously move in the same direction 

 everywhere in the Northern {or Southern) Ilemisphere. 



From calculations we have, elsewhere, demonstrated that 

 the varying length of the seasons alone during the precession 

 of the equinoxes will caiise an increase or decrease in the force 

 of the current of several percent of the total. And these termes 

 are doubtless below the true ones, but which space does not here 

 permit of developing. We may, therefore, with a high amount 

 of probability conclude that the precession of the equinoxes 

 causes periodical variations of the ctimate, tvhich are great enoiigh 

 to explain all the facts on ivhich the theory for these periodical 

 variations is has ed. 



But the excentricity of the earths orbit changes so rapidly 

 that in two consecutive half-cycles it is not accurate the same. 

 Therefore, will variations in the strength of the sea-currents, 

 and consequently also those in the climate, in one half-cycle 

 not be quite balanced in the next, and it might even be pos- 

 sible that greatcr and more lasting variations of the climate 

 might he caused hy the same agendes. 



Trykt 18 Juni 188G. 



