ARBORICULTURE. 



367 



6th. Damp clayey soil incumbent on clay. 

 Coarse siliceous gravel, 

 Fine sand, ..... 



Vegetable matter, destructible by fire, 

 Carbonate of lime, .... 

 Silica, or earth of flints, 

 Alumina or pure clay, 

 Oxide of iron, . 



GO 



120 



9 



15 

 130 



48 



10 



Soluble saline matter, with vegetable extract and gypsum, 8 



400 



The oak, elm, ash and hornbeam attain to greater perfection 

 here than any other kind of forest tree. The tulip tree 

 (Liriodendron tulipifera) grows freely on this soil when it is 

 properly prepared by trenching. 



7th. Fertile peat moss, incumbent on clay or marl. 

 Fine siliceous sand, .... 



Undecompounded vegetable fibre, 

 Decomposing vegetable fibre, 

 Silica, or impalpable earth of flints, 

 Alumina, or pure matter of clay, 

 Soluble matter, principally vegetable extract, 

 Oxide of iron, ..... 



Moisture and loss, . . . . < 



231 

 13 



57 

 50 

 18 

 4 

 2 

 25 



400 

 This variety of peat soil when prepared for planting by draining 

 ofTthe superfluous moisture, with which it is found almost always 

 saturated, is capable of growing very profitable trees, as the 

 birch, poplar and willow. A piece of ground of this nature, 

 prepared by cutting open drains at such distances from each 

 other, as to leave a sufficient breadth or body of earth to 

 retain a due proportion of moisture in dry weather, and yet 

 prevent saturation of moisture in the wettest weather, was planted 

 with a variety of trees. The trees above mentioned succeeded 

 remarkably well, and made an improved return of a hundred per 



