268 ON SOME N.S.W. TAN-SUBSTANCES. 



81. Acacia sentis, F. v. M., N.O. Leguminosse, B. Fl., ii., 360. 

 See Proc. R. S., KS.W, xxL, 29. 



Sample obtained from Cobham Lake, Milparinka. " Prickly 

 Acacia." Height of tree, 15 to 20 feet; diameter, 4 to 6 inches. 

 Collected 20th August, 1887. Analysed 15th to 16th August, 

 1888. 



This bark would scarcely be taken for the product of a dry- 

 country wattle. It is from a younger tree than the bark already 

 described (xxi., 29), and is almost perfectly smooth and of a light 

 brown colour. The collector reports, " When fresh it is of a 

 beautiful bright green colour, much like the bark of A. decurrens. 

 I found it easier to strip than any other bark I have stripped 

 yet." It is very compact, and the inner bark contains some clean 

 looking fibre. Average thickness, J inch. Colour of dry powder, 

 very light drab. 



Extract — 33 "82 per cent. Colour, orange brown; of moist 

 residue, light reddish-brown, inclining to Sienna brown. 



Tannic acid — 10*26 per cent. Non-tannin and impurities — 

 1-422 per cent. A very fair percentage of tannic acid, and 

 tending to show the advantage of stripping young trees of this 

 species. 



82. Acacia salicina, ZindL, N.O. Leguminosse. B. FL, ii., 367. 



Found in all the Colonies except Tasmania. 



Sample obtained from Tarella, "Wilcannia. " Native Willow." 

 Height of tree, 20 to 25 feet ; diameter, 12 to 18 inches. Collected 

 15th August, 1887. Analysed 15th to 16th August, 1888. 



A coarse flaky bark, not so fibrous, more compact, and altogether 

 more promising looking than most of the dry-country barks. 

 General colour brownish, and of inner bark reddish. From the 

 cut ends of most, if not all of the pieces of bark, there exudes a 

 small quantity of a resinoid gum, of a yellow colour, and pure 

 bitter taste. This pure bitter flavour can scarcely be detected on 

 chewing the inner layers of the bark, as it is masked by the very 

 astringent matter present. Average thickness up to f inch. 

 Colour of dry powder, light dirty brown, with particles of dark 

 dirty brown. 



Extract. — 35-28 per cent. Colour, bright ruby ; of moist 

 residue, dark pure brown. 



Tannic acid — 13-206 per cent. (The blacks are aware of the 

 value of this tan-bark, as they use it for tanning wallaby and 

 other skins.) Non-tannin and impurities — 1-524 per cent. 



