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



to the lengthened period they have been on the trees, they contain 

 but a small proportion of essential oil. 



Extract. — Dissolve in water at 100° C. to the extent of 70 - 22 

 per cent., leaving 29*78 per cent., of residue of an umber colour. 

 The colour of the extract is the same as that of A. decurrens, with 

 an olive shade added. I would direct attention to the great 

 difficulty of removing the last portions of extractive matter from 

 these galls, by means of boiling water — a period of from three to 

 five days being necessary for the purpose. 



Kino-tannic acid — 43*4 per cent. 



18. Eucalyptus Gunnii, Hooker, fil. var., N.O. Myrtacese, B. Fl. 

 iii., 246. 

 Figure, Decade iv., of Baron Mueller's " Eucalyptographia." 

 Found chiefly in Tasmania, but also in Eastern Victoria, and 



in New South Wales, as far as Berrima. Always found 



in more or less damp situations. 

 Vernacular Name (of this variety) — " Flooded Gum," or 



" Bastard Gum." Timber brittle, not used. 

 Locality whence this particular specimen was obtained — ■ 



Delegate, near Bombala, N.S.W. 

 Geological Formation — Mudstone (Silurian). 

 Part of the Tree Examined — Bark. 

 Particulars of the trees whence it was obtained — Height 60 



to 80 feet, diameter 2 to 3 feet. 

 Collected 8th May, 1887. Analysed 5th to 18th July, 1887. 



A dark grey or nearly black, deeply fissured bark. Portions of 

 the outer bark are almost as hard as those of some Ironbarks, 

 others, however, are flaky and friable. Inner bark or bast thick 

 but short and brittle, therefore useless as a fibre. Average 

 thickness of bark f inch. This bark is remarkable for the essential 

 oil it contains, which causes it to be exceedingly fragrant. It 

 forms a dull light-brown powder. Colour of residue (after 

 treatment with water to extract soluble portion), light brown. 

 The solution has a whitish appearance, owing to the presence of 

 essential oil in a fine state of division. 



Extract. — 19-4 per cent, to water at 100° C. 



Kino-tannic acid — 9*45 per cent.* 



* Baron Mueller gives (Decade iv., " Eucalyptographia.") 3'44 per cent* 

 of tannin for E. Gunnii bark, as the result of "a solitary experiment." 

 My lowest percentage with the Delegate variety was 9-44 per cent., with 

 the Bombala variety 11*2. These analyses are all reconcileable doubtless, 

 and afford another instance of the necessity for full particulars to 

 accompany tan-analyses. 



