THE TROPICAL ZONE. 75 



CHAPTER III. 



The tropical zone Tree ferns Ipomaea Passionflower- 

 Victoria Potato Arrow-root Dumb-cane Manchineel 

 Hura Sandwich Islands Pandanus Pine apple Banana 

 Taro China The sub-tropical zone Succulent plants- 

 Euphorbias Fig tribe India-rubber Banian Dracaena 

 Desert Papyrus Egypt Gourd tribe Acacia Balm of 

 Gilead Tamarisk Henna Coffee The Land of Promise 

 Date palm Lily Cedar Olive Pomegranate Carob 

 Myrtle India Teak tree Castor oil Lemon grass- 

 Spikenard Cotton Himalayas China Tea Rice Aus- 

 tralia Acacias Eucalyptus Epacris Grass tree South 

 Africa Proteas Heaths Geraniums Mimosa Aloe 

 Cycas House-leek tribe Deserts North America To- 

 bacco Mexico Agave Furcraea South America Cactus. 



THE Tropical Zone extends from 15 N. or s. 

 lat. to the tropics respectively, and has an 

 average temperature of from 73 to 80 Fahr. 

 The principal countries embraced by this zone 

 are, parts of Bolivia, Brazil, and Paraguay, in 

 South America ; the majority of the West 

 India Islands, Yucatan, Guatemala, and part of 

 Mexico ; Nubia and Senegambia, in Africa ; 

 Madagascar, Mauritius, and North Australia ; 

 parts of China and India, Burmah. and the 

 south of Arabia. A considerable part of the 

 countries within this zone lies under such con- 

 ditions, that, from want of sufficient moisture, 

 and from having too poor a soil, they are des- 



