ON SOME N.8.W. TAN-SUBSTANCES. 31 



3. Bromine water — Dirty yellow ppt. 



4. Dilute ferric chloride — Reaction same as A. decurrens. Add 

 Ammonia — Same as A. decurrens. 



5. Baric hydrate — Dark brown ppt, same as A. decurrens. 



6. Ammonium sulphide — Light olive-brown colour. (Decidedly 



different in tint to that of A. decurrens). 



7. Potassium bichromate — Same as A. decurrens. 



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



Pink gelatinous ppt. 



9. Copper sulphate — Same as A. decurrens. Add Ammonia — 



Same as A. decurrens. 



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

 a white glazed tile). — Magenta colour, by no means so vivid 

 as that of A. decurrens. 



11. Lead nitrate — Same as A. decurrens. 



12. Manganese sulphate — No change. 



13. Chrome alum — Same as A. decurrens. 



14. Mercuric chloride — Ditto. 



15. Hydro-disodic phosphate — Ditto. 



16. Potassium ferrocyanide — Ditto. 



Acacia melanoxylon, (R. Br.), N. O. Leguminosse, B. Fl. ii., 388. 

 " Blackwood," " Lightwood." 



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

 Locality of the particular specimen now under examination : — 

 Monga, near Braidwood, N.S.W. 



Remarks — The bark of the trunk. Diameter of stem 3 feet from the 

 ground, 1 foot. Height 40 to 50 feet. Date of Collection, 29th 

 Sept., 1886. Date of Analysis, 12th and 23rd May, 1887. 



This tree does not attain its full luxuriance in New South Wales. 

 The bark now under examination is, judging from its appearance, 

 apparently from an old tree. It is of a dirty brown colour, with 

 whitish patches, giving the whole a silvery appearance. Has 

 irregular vertical fissures, and this circumstance, with the small 

 horizontal cracks, causes the outer bark to be readily detached in 

 small flakes. The inner bark or bast is very strong, and would 

 form an excellent coarse tying material for local use. Where it 

 joins the outer bark it is of a reddish-brown colour, but yellowish 

 near the wood. In passing, I may mention that many of the 

 inner barks of our Acacias show a rich red colouring when newly 

 stripped. It usually requires a little exposure to bring out the 

 colour in its full intensity, but prolonged exposure to the air 

 destroys it. Other barks are of a white colour when newly 

 stripped, but turn yellowish or drab on exposure to the atmosphere 

 — doubtless from oxidation. 



