XX. 



Fig. 1. Populus Dllalnta spreadbig by suckers over the blow sand into the blowout. 

 Jajnesii s^owi^ in ahinidance in the rij^ht foreground. — I'non the Popvlus 

 are Metnrhroma paralieluiri anti .1/. angustulum . 



Cristatella 



Fig. 2. A dune has invaded a wahiut grovn. I he ground ctner on the ^loi^t .shaded sand is mainly 



Solaniitn nigrum and Sicuos nugulaUtn. ^ViH\^r Ioks are Ischnoptera incrqualis, 



Udeopsyllu Tobusta, Panga'Ud, etc. 



