COMPOSITION OF VARIOUS TREES 163 



The ashes of Salix contain in 100 parts : — 



One ton of Salix extracts 32 lbs. of mineral 

 matter from the soil. 



The white, purple, and yellow barks of certain 

 species of willow form an effective contrast to the 

 sombre coloured barks of other trees {e.g., Salix 

 aurea has a yellow bark, and Salix purpurea has 

 a red bark). 



The twigs of several species of wiUow are used 

 in basket making, and the wood of Salix caprcea 

 is chiefly converted into charcoal. 



The bark of Salix alba and other species contain 

 salicin, tannic acid, and colouring matter. 



Sciadopitys {Sciadopitys verticillata, um- 

 brella pine, Natural Order, Coniferse) is a hardy 

 evergreen tree bearing long tapering leaves. 

 It grows in rich moist loamy soils in sheltered 

 positions. 



M 2 



