74 P- A. ØYEN. 



based upon geographical or topographical characters, or without 

 any real foundation whatever. But it is not till we get a hold 

 of the genetic principle, that, even here, we shall be able to effect 

 a classification of an adequate form. We must, however, be 

 very careful not to lay such stress upon endogenetic characters, 

 that we completely reject the exogenetic. There is no doubt, 

 that the genetic principle, having proved to be of such very great 

 importance to other branches of natural science, will have quite 

 the same result in comparative glaciology, when used in a manner 

 adapted to this particular branch of science. 



Without entering on this occasion into detail as to the classi- 

 fication of forms and types, we will only call attention to some 

 leading features. Taking into consideration the different forms 

 of glaciation, the following classification will prove very suitable: 



Polar Glaciation, 

 Continental Glaciation, 

 Local Glaciation. 



In studying the glaciers of our own country, we shall only 

 meet with 'the last of these three groups in a fully developed 

 state. But in addition to this, we shall also meet with a single 

 section of the second group, as well as with some mere rudi- 

 ments from the first. 



Within the group of Local Glaciation we may, very suitably, 

 introduce three sections : 



Valley-Glaciers, 

 Cirque-Glaciers, 

 Hang-Glaciers. 



These types of glaciers we meet with in a very well deve- 

 loped state in various places throughout our native country. On 

 the occasion mentioned above there was proved to exist a gene- 

 tic connection between these forms of glaciation, and between 

 these types of glaciers. 



