BY J. H, MAIDEN. 615 



To cold water it yields a medium ruby-coloured solution. The 

 residue contains particles of fibrous bark, together with phloba- 

 phene of a dark ruby colour. Residue Vandyke brown, 



Kino-tannic acid, 64-4 per cent. ; insoluble phlobaphenes, 5*52 

 per cent. ; soluble in cold water, 93*78 percent. 



Eucalyptus obliqua, L^Herit., B.Fl. iii. 204 (Syn. E. gigantea^ 

 Hook. f. ; and other synonyms.) 

 Found in South Australia, Victoria, Tasmania, and N. S. Wales. 



Following are the results of Dr. Wiesner's examination of two 

 Kinos of this species : — 



"^. gigantea. Little soluble in water; solution brownish, 

 neutral, no turbidity, rich in gum-resin. Tough, drop-like pieces, 

 of a zircon red. 



" E. obliqua. Taken as identical with E. gigantea. Completely 

 soluble in water, with deep red colour, neutral, no turbidity, free 

 from gum-resin. Looks like Kino. 



" E. gigantea. Add to solution first HCl and then NH4 HO, 

 yellowish-red ppt, which on exposure to the air becomes of rusty 

 red. 



" E. obliqua. Dark violet ppt under the same circumstances." 



The first sample was evidently much older than the second. 



16. " Stringybark." (Botanic Gardens, Sydney, received 29th 

 December, 1887.) 



Another Kino which must have been collected for a very long 

 period. It looks perfectly black by reflected light, and has much 

 the appearance of jet. It is fairly brittle, but rather difficult to 

 reduce to an impalpable powder, which is rich Vandyke brown in 

 colour. 



Cold water yields a clear dark reddish-brown solution. The 

 phlobaphene residue is very abundant, and almost a perfect model 

 of the original Kino. 



Kino-tannic acid, 21*4 per cent. ; insoluble phi oba])heneR, 48'52 

 per cent. ; soluble in cold water, 38*9 per cent. 

 40 



