IN OTHER COUNTRIES. 101 



1. The Subtropical Region, from the sea level to 100 feet 

 of elevation, where tropical plants are cultivated ; as the 

 Date, Sugar cane, Banana, Papyrus, Mimosas, Acacias, 

 &c. 



2. The Colline Region (regio collina), beginning with 

 the former at the sea level, and ascending to 2000 feet of 

 elevation, where the cultivation of the Vine ceases. It is 

 subdivided into two parts ; in the first, Wheat, Maize, 

 Rice, Cotton, and the Pistachio are cultivated ; in the 

 second, the Vine, Wheat, and Maize do not grow so well, 

 and the Pistachio, Rice and Cotton are wanting. (Cle- 

 matis Vitalba, Berberis vulgaris, Matthiola sinuata, Chei- 

 ranthus Cheiri are referred to this region in specifying 

 the stations of species, in vol. 1., the only one yet reaching 

 me.) 



3. Lower Wooded Region, or that of Oaks and Ches- 

 nuts, extends from 2000 to 400Q feet. Rye is frequently 

 cultivated. (Acer Pseudoplatanus.) 



4. The Region of the Beech and Scotch Fir occurs at 

 4000 — 6000 feet. Here are Draba aizoides and Betula 

 alba. (Acer campestre.) 



5. The Subalpine Region, 6000 — 7500 feet, found on 

 Etna only, has a dry, sterile, volcanic soil, nourishing few 

 vegetables. 



6. The Alpine Region, 7500—9000 feet. 



7. The Region of Lichens, 9000—9200 feet. Above 

 this, 9200 — 10,488 feet, the summit is altogether sterile. 



In the Personal Narrative of Humboldt it is mentioned 

 that Saussure found a decrease of temperature of 1° C. 

 for 91 toises of ascent on Etna; that is, 1°.8 Fahr. for 

 very nearly 582 feet, or 1° Fahr. for 323 \ feet. Assuming 

 an equal decrease (not quite accurate) , and 65° for the 

 mean temperature on the sea level, we have nearly the 

 following scale. 



f 3 



