6 POPULAR GEOGRAPHY OF PLANTS. 



1. The Eegion of Palms and Bananas, extending from 

 the level of the sea to an altitude of 1900 feet; with a mean 

 annual temperature of 81 Fahr. 



2. The Region of the Tree-Perns and Figs, from 1900 

 feet to 3600 and 3800 feet; mean temperature 74. 



3. The Region of Myrtles and Laurels, 3800 or 3900 

 feet to 5700 feet; mean temperature 68. 



4. The Region of Evergreen Trees, from about 5700 feeq. 

 to above 7600 feet; mean temperature 63. 



5. The Region of Deciduous Trees, from 7600 feet to 

 9500 feet; mean temperature 58. 



6. The Region of AUetina (Firs), from 9500 feet to 

 11,500 feet; mean temperature 52. 



7. The Region of Rhododendrons extends (and that of 

 the plants which represent them in the New World Be- 

 jaria ought to extend) from 11,400 feet to 13,300 feet; 

 mean temperature 45. 



8. The Region of Alpine Plants, from the upper limit of 

 bushes to the line of perpetual snow; mean temperature 38. 



These divisions appear however (as Meyen himself allows) 

 to be sometimes a little at variance with facts; but he 

 thinks that more extensive observations will establish his 

 theory. 



