Naturalisation in Extra- Tropical Countries. 



other principal kinds of catechu are tropical products from Areca 

 Catechu and Nauclea Gambir, that of the latter being obtained 

 from some congeners also. The import of cutch and gambir into 

 the United Kingdom during 1886 was 28,352 tons, valued at 

 654,218. 



.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 concinna, De Candolle. 



India, China, Praised by Dr. C leghorn as a valuable hedge- 

 shrub. The pod contains saponin. 



Acacia dealbata, Link. 



South-Eastern Australia and Tasmania. This tree is generally 

 known amongst Australian colonists as Silver- Wattle. It prefers 

 for its habitation humid river-banks, and sometimes attains there a 

 height of 150 feet, supplying a clear and tough timber used by 

 coopers and other artisans, but principally serving as select fuel of 

 great heating power. From the thinly-split wood elegant baskets 

 can be made. The bark of this tree is thinner and inferior in 

 quality to that of the Black Wattle, yielding generally much less 

 quantity of tannin-principle. Mr. J. H. Maiden determined the 

 average proportion of mimosa-tannic acid in absolutely dry bark as 

 21.22 against 30.08 of A. mollissima. He relies on the color- 

 reaction, given by a drop of concentrated sulphuric acid, as the 

 most valuable for roughly ascertaining the strength of tan-samples ; 

 that from the rich wattle barks gives rose-madder color, and all 

 give shades of color proportionate in tint to the percentage of 

 tannin. Bark chiefly employed for lighter leather. This tree is 

 distinguished from the Black Wattle by the silvery or rather ashy 

 hue of its young foliage ; it flowers early in spring, ripening its 

 seeds in about 5 months, while the Black Wattle occurs chiefly on 

 drier ridges, blossoms late in spring or at the beginning of summer, 

 and its seeds do not mature in less than about 14 months. This hardy 

 Acacia could doubtless, for tan purposes, be remuneratively reared 

 so far north as the Channel-Islands. It bears more cold than A. 

 decurrens, A. mollissima and A. pycnantha. 



Acacia decurrens, Willdenow.* 



The Sydney Tan- Wattle. New South Wales and southern part 

 of Queensland, rare in Victoria, A middle-sized tree. Its wood is 

 used for staves, for turners' work, occasionally also for axe, and 

 pick-handles and many other purposes ; it supplies an excellent 

 firewood ; a chief use of the tree would be also, to afford the first 



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