COMPOSITION OF VARIOUS TREES 107 



One ton of Hamamelis extracts 25 lbs. of mineral 

 matter from the soil. 



The dried bark of Hamamelis virginiana 

 contains from 8 to 10 per cent, of tannic acid, and 

 a trace of volatile oil. It is used in the preparation 

 of the tinctura hamamelidis. The leaves are used 

 in the preparation of the extractum hamamelidis 

 liquidum, liquor hamamelidis, and unguentum 

 hamamelidis of the British Pharmacopoeia. 



Hawthorn {Cratcegus oxyacantha, Natural 

 Order, Rosacese), deciduous flowering tree. It grows 

 in ordinary and rich soils, and is useful for hedges. 



The ashes of the wood contain in 100 parts : — 



One ton of Crataegus extracts 24 lbs. of mineral 

 matter from the soil. 



Heath {Erica cinera, Natural Order, Ericaceae) 

 is a hardy evergreen flowering shrub, and prefers a 

 peaty soil. 



