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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 
"og ındıq 
‘psoumsd snjndog ‘€ :Jo SoAUIT 
‘(98 WEISSPLL Ystuejog) 
*‘Dorniydno snyndog ‘4 
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 (I. c. p. 188) how in spring when the 
