INTRODUCTION. 5 



high) would be the same as the number of zones from that 

 in which it stands, to the pole. 



The eight zones (Plate I.) are as follows : 



1. The Equatorial Zone, including 15 of latitude on each 

 side of the Equator. 



2. The Tropical Zone, from 1 5 of latitude to the Tropics. 



3. The Sub-Tropical zone, from the Tropics to 34 of 

 latitude. 



4. The Warmer Temperate Zone, from 34 to 45 of 

 latitude. 



5. The Colder Temperate Zone, from 45 to 58 of lati- 

 tude. 



6. The Sub-Arctic (and Sub-Antarctic) Zone, from 58 

 of latitude to the Arctic (and Antarctic) Circle. 



7. The Arctic (and Antarctic) Zone, from the Arctic (and 

 Antarctic) Circle to 72 of latitude. 



8. The Polar Zone, including all the land above 72 of 

 latitude. 



The corresponding Yertical Regions (Plate II.) into 

 which, according to Meyen, mountains may be divided, are 

 the following :"* 



* It will be remembered that, as a general rule, the mountains of the 

 Equatorial Zone alone can exhibit all the eight regions. 



