12 H. MØLHOLM HANSEN 
of 1000—1100 m., the lower limit of permanent snow-drifts lies at 
a height of 600—700 m. above sea level, and that of the variable 
snow-drifts at a height of 500—600 m. 
The setting up of climate zones, i. e. of a zone of lowland 
climate, a zone of highland climate, and various snow zones, results 
in a similar formation of floristic and vegetation zones to which we 
shall contribute in the following. 
