114 



attain a greater height than the others. At higher levels where 

 the surface is perfectly dry during summer except that it may 

 at times be flooded by the river, but where a water-supply 



21 

 f 







I 



I 



I 



derived from the river is available at a slight depth, the poplars 

 often become large trees sometimes interspersed in the thickets, 

 sometimes forming' forests. 



ANTONOW describes (1. c. p. 188) how in spring when the 



