KECLAMATION OF THE SOIL. 



141 



in view a continuous line of paling is erected, consisting of 

 planks about 6 feet long \)y 6 inches Avide, 1 inch thick, and 

 pointed at the lower end. The planks are inserted into the 

 ground to about half their length, an inch apart, the direction 

 of the line being parallel to the coast. Against this fence the 

 sand is deposited, a certain portion being forced through the 



Fig. 20. 



a. Sea level. 



b. Paling iu three successive positions. 



c. First wattle fence, 



d. An additional wattle fence. 



e. Original surface of littoral dune. 



/, ff. Surface of littoral dune in two subsequent stages. 



(The heights are exaggerated.) 



interstices and coming to rest in the comparatively quiet air 

 immediately behind the paling. As soon as the accumulation 

 of sand approaches the upper ends of the planks they are 

 pulled up about 3 feet by means of levers, and this process is 

 repeated until the artificial dune has reached such a height 

 that no sand can be carried over the top (see Fig. 20). 

 Simultaneously with the first erection of the paling a wattle 



