ON SOME N.S.W. TAN-SUBSTANCES. 35 



tuberculated. Colour of outer bark that of the bark of the cork- 

 tree. Brittle, and inside of a reddish-brown colour. Average 

 thickness about ■&■". Inner bark very smooth, of about half the 

 thickness of the outer-bark, very tough, and evidently available 

 for coarse fibre. My attention was directed to this bark through 

 learning that in the neighbourhood of Braidwood it is used by the 

 settlers for tanning, " with excellent results." It yields 21*4 per 

 cent, of extract to water at 100° C. Per centage of tannic acid 7*74. 



Qualitative Tests — (Dilute extract). 



1. Reaction faintly acid. 



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



turbidity. On boiling, no change. 



3. Bromine water — Ochrey yellow ppt. 



4. Dilute ferric chloride — Blackish-green colouration. Add 



Ammonia — -Reddish-purple ppt. 



5. Baric hydrate — Copious reddish-brown ppt. 



6. Ammonium sulphide — Orange turbidity. 



7. Potassium bichromate — Coffee- coloured ppt. 



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



Brownish-white ppt. 

 • 9. Copper sulphate — Hardly to be distinguished from A. aneura 

 Add Ammonia — Light brownish-green ppt. 



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

 white glazed tile) — Yellowish-brown colour. 



11. Lead nitrate — Pale dirty brown ppt. 



12. Manganese sulphate — Slight brownish ppt. 



13. Chrome alum — Ditto. 



14. Mercuric chloride — Slight whitish-brown or stone coloured ppt 



15. Hydro disodic phosphate — Turbidity. 



16. Potassium ferrocyanide — Orange-brown ppt. 



Eucalyptus stellulata, (Sieber), N.O. Myrtacese, B. Fl., iii., 200. 

 Usually called " Black Gum," or " Black Sally." 

 Found— In Victoria and New South Wales. Locality of the particular 

 specimen now under examination : — Blue Bell, near Braidwood, 

 New South Wales. 

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

 ground, 2 feet. Height 30 to 40 feet. Date of Collection, 17th 

 Oct., 1886. Date of Analysis, 16th and 21st May, 1887. 

 An "Ironbark," of a blackish or dark-grey colour. Exceedingly 

 hard, moderately fissured, and portions of it almost smooth. 

 Average thickness Y- No kino visible to the naked eye. Inner 

 bark of a light brown colour when dry. (Note. — From decorti- 

 cation, this tree often appears of a greenish or leaden colour, 

 and smooth). Yields 27*64 per cent, of extract to water at 100° C. 

 Kino-tannic acid 12 '8 6 per cent. 



