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



It yields 20'63 per cent, of extract to water at 100° C. Catechu 

 tannic acid 11*12 per cent. 



Qualitative Tests — (Dilute Extract) 



1. Reaction faintly acid. 



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



On boiling, yellowish-brown ppt. 



3. Bromine water — Bright yellow ppt. 



4. Dilute ferric chloride — Dark indigo purple colour. Ppt on 



standing. Add Ammonia — Ppt becomes dark purplish-brown. 



5. Baric hydrate — Dirty brown ppt. 



6. Ammonium sulphide — Orange colour. 



7. Potassium bichromate — Orange brown ppt. 



8. Tartar Emetic — No change. Add Ammonic Chloride — 



Whitish-brown ppt. 



9. Copper Sulphate — Slight dirty green ppt. Add Ammonia — 



Copious Yandyke-brown ppt. 



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

 white glazed tile) — Light brown colour. 



11. Lead nitrate — Slight orange-brown ppt. 



12. Manganese sulphate — Whitish-brown ppt. 



13. Chrome alum — Turbidity. 



14. Mercuric Chloride— Whitish ppt. 



15. Hydro disodic phosphate — Turbidity. 



16. Potassium ferrocyanide — Light purplish-brown ppt. 



Acacia aneuka, (F.v.M.), N. O. Leguminosse, B. Fl. ii., 402. (The 

 normal species). The common " Mulga" forming the chief portion 

 of the scrub of that name. Occasionally called "Myall." 

 Found — In all the Colonies except Tasmania, but only in the dry 

 interior. Locality of the particular specimen now under 

 examination : — Ivanhoe, via Hay, N.S.W. 

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

 ground, 6 to 8 inches. Height of tree, 25 or 30 feet. Date of 

 Collection, 26th Sept. 1886. Date of Analysis, 17th and 21st 

 May, 1887. 

 This bark is very deeply furrowed, flaky, and pulverulent, and 

 apparently from a very old tree. Outer bark grey ; the inner 

 bark of a pale drab. Average thickness §". Yields 10 per cent. 

 of a slightly mucilaginous extract to water at 100° C. (This 

 round number is the exact mean of several careful determinations). 

 Catechu-tannic acid 4 -7 8 per cent. 



Qualitative Tests. — (Dilute extract — normal species only used, as 

 the variety gives similar reactions). 



1. Reaction faintly acid. 



2. Equal volume of sulphuric acid (1 in 5). In the cold, no change 



On boiling, slight bleaching, and faint turbidity. 



