2 ' Select Plants for Industrial Culture 



'. . 'kinds of gum. ara-bl-e for medicinal and technical purposes. The lac- 

 insect lives also on the foliage, and thus in Sind the lac is mainly 

 yielded by this tree. The stem attains a circumference of 10 feet. 

 The astringent pods are valuable for tanning, also the bark, which is 

 known as "Baboot" bark; the wood is very durable if water-seasoned, 

 extensively used for wheels, well-curbs and many kinds of imple- 

 ments, also for the knees and planks of boats. This species is of com- 

 paratively quick growth. A. Ehrenbergiana (Hayne) is among the 

 species, which yield gum arabic in North- Africa. A. latronum 

 (Willdenow) and A. modesta (Wallich) form thorny hedges in India 

 according to Dr. Brandis. 



Acacia armata, R. Brown. 



Extra-tropical Australia. The Kangaroo-Thorn. Much grown 

 for hedges, though less manageable than various other hedge-plants, 

 and not so fire-proof. More important for covering coast-sand with 

 an unapproachable prickly vegetation. 



Acacia binervata, I>e Candolle. 



Extra- tropical East- Australia. A tree attaining a height of 40 feet. 

 The bark used by tanners, but not quite so valuable as that of A. 

 decurrens (W. Dovegrove). 



Acacia Catechu, Willdenow. 



India, East- Africa, up to 5,000 feet. A tree attaining 40 feet in 

 height. Will bear some frost (Brandis). Wood hard, heavy, ex- 

 tremely durable, locally chosen for underground posts, particularly 

 also mill-work. The extract prepared from the bark and heartwood 

 is the catechu of medicine or cutch of tannery. Pure cutch is worth 

 about 25 per ton; 4 tons of bark will produce 1 ton of cutch. A. 

 Suma (Kurz) is closely allied. 



Acacia Cavenia, Hooker and Arnott. 



The " Espino " of the present inhabitants of Chili, the " Cavan " 

 of the former population. A small tree with exceedingly hard wood, 

 resisting underground-moisture. The plant is well adapted for hedges. 

 The husks contain 32 per cent, tannin (Sievers), particularly valuable 

 as a dye-material. 



Acacia Cebil, Grisebach. (Piptadenia Cebil, Grisebach.) 



La Plata-States. This is one of the most useful of all trees there, 

 on account of its bark, which is exceedingly rich in tannic acid; a 

 species well worthy of introduction elsewhere, even as an ornamental 

 tree. Numerous other Acaciae, particularly the Australian species, 

 deserve yet tests for tannin. 



Acacia concinna, De Candolle, 



India, China. Praised by Dr. Cleghorn as a valuable hedge-shrub. 

 The pod contains saponin. 



