OE, PLAItf TEACHING. 



13 



After the rainy season a vi- 

 gorous vegetation rapidly springs 

 up again. Pampas are other 

 plains of South America, upon 

 which coarse grass, wild oats, 

 canes, reeds, and thistles grow 

 in rank abundance. Silvas are 

 ivooded plains, 3, consisting of 



vast forests, with dense under- 

 wood, the whole matted together 

 with creeping plants. Such are 

 the great woods of South Ame- 

 rica, occupying the low-lands, 

 through which the Amazon Eiver 

 flows. Deltas are plains rendered 



fertile by the waters of rivers, as 

 the Nile, Niger, and Mississippi, 

 4. # The Tundra is a succession 



* They are so called, because the waters receding 

 from the land generally fall off on three sides, leaving 

 the land in a triangular form, . which, being the form 

 of the letter A of the Greek alphabet, takes the name 

 Oi delta. 



of desert tracts, 5, which lie upon 

 the Plain of Siberia, towards the 



138. 



Polar Sea. In summer these 

 tracts are covered with moss, and 

 interspersed with numerous lakes 

 and marshes ; in winter they are 

 buried under a solid covering of 

 ice. When the ice and snow dis- 

 appear, coarse grass and rushes 

 spring up, and stunted willows 

 thrive during the brief Siberian 

 -summer. Karroos are plains in 

 the interior of Southern Africa, 

 remarkable as being the haunts 

 of innumerable wild beasts, 6. 



Here we find the elephant, rhino- 

 ceros, giraffe, crocodile, etc. etc. 



