GRAZING. 329 



to take the place of the lowest vat each vat being meanwhile 

 moved up one step. 



The crude potash is calcined in a fire-proof furnace to drive 

 off the moisture thoroughly, when it becomes a white powder 

 ready for packing into barrels. In calcining, from 10 to 20 

 per cent of the raw potash is lost. Even on the Continent 

 potash -burning in the woods has now almost entirely given 

 place to preparation in chemical works. 



Grazing in woodlands may often be profitable when woods 

 are about twenty years of age, and begin to show an under- 

 growth of grass, as is especially the case in Larch woods ; and 

 when a fall is left fallow for two or three years to obviate 

 attacks of the Pine-weevil, the grazing is sometimes well worth 

 having. Woodland grazing is reckoned to have from J to 

 the feeding-value of good meadow grass. 



The improvement in the grazing value of the land was 

 formerly estimated to be of itself sufficient to make Larch- 

 planting beneficial in the Highlands of Scotland, quite apart 

 from the profit obtainable from timber. 



