136 MANURES FOR FRUIT TREES 



The bark of the " tulip tree " contains a sub- 

 stance called liriodendrin. 



Locust Tree {Robinia pseudacacia), false 

 acacia, Natural Order, Leguminos^) is a hardy 

 deciduous flowering tree with light green leaves. 

 It grows in ordinary soils. The ashes of Robinia 

 contain in 100 parts : — 



Iron oxide 2'10 



Manganese dioxide . . . 0"02 



Alumina 0'31 



Lime 26-24 



Magnesia 12-55 



Potash 20-32 



Soda 10-11 



Phosphoric acid . . . 8-63 



Sulphuric acid . . . 1-42 



Chlorine . ... 0-77 



Silica 17-53 



The tree was introduced into this country from 

 North America in 1640. 



Robinia pseudacacia umbraculifera, or globe 

 acacia tree, grows in Germany, England, and other 

 countries. This variety has the habit of producing 

 only short shoots which hang down, and in the 

 mass form a round head. 



