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



7. Potassium bichromate — Ppt similar to, but slightly darker than 



that of A. melanoxylon. 



8. Tartar emetic — No change. Add Ammonium chloride — 



Whitish-brown ppt. 



9. Copper sulphate. — Slight dirty green ppt. (a little darker than 



that of A. melanoxylon). Add Ammonia — Vandyke brown ppt. 



10. One drop of strong sulphuric acid to one drop extract (on a 



white glazed tile). Like the colour yielded by A. aneura, 

 only a little more intense. 



11. Lead nitrate — Slight orange-brown ppt. 



12. Manganese sulphate — Turbidity. 



13. Chrome alum — Slight turbidity. 



14. Mercuric chloride — Light stone-coloured ppt. 



15. Hydro-disoclic phosphate — Slight purplish ppt. 



16. Potassium ferrocyanide — Light orange-brown ppt. 



Acacia penninervis, (Sieber), N. O. Leguminosae, B. Fl. ii., 362, 

 "Hickory," "Blackwood." 



Found — In all the Colonies except South and Western Australia. 



Locality of the particular specimen now under examination : — 



Monga, near Braidwood, N.S.W. 



Remarks — A. Bark of the trunk ; B. bark of the branches. Diameter 



of stem 3 feet from ground, 10 inches. Height 20 to 30 feet. 



Date of Collection, 19th Oct., 1886. Date of Analysis, 16th and 



23rd May, 1887. 



A.. Bark of trunk. — Smoothish bark, of a dirty brown colour. 



The epidermis peels off in scales, showing a bright reddish-brown 



colour. Bast very fibrous. Average thickness of bark as stripped 



|". Yields 455. per cent, of extract to water at 100° C. (a 



remarkably high percentage) ; or 55*5 per cent, of residue. Of 



this residue a portion equal to 2*4 per cent, of the total quantity of 



bark acted upon, is soluble in alcohol at 60° P. Catechu-tannic 



acid 16*96 per cent. 



B. Bark of branches. — Smoother than that of the trunk, yet 

 not perfectly smooth. Outwardly of a dirty grey colour, with 

 patches of white, or very light grey. Inner bark of a very bright 

 colour, being, even when thoroughly dry, of a warm red brown. 

 (I would especially draw attention to this as a pigment-yielding 

 species). Bast available for coarse tying material. Average 

 thickness of bark -£/. Yields 22 88 per cent, of extract to water 

 at 100° C. Catechu-tannic acid 16-24 per cent. 



Qualitative Tests. — (Dilute extract of trunk-bark). 



1. Reaction slightly acid 



2. Equal volume of sulphuric acid (1 in 5) In the cold, yellowish 



ppt. On boiling, dark salmon ppt in small quantity. 



