417 



100-00 

 Tannic acid determination (Lowenthal), 44 per cent. 



Eucalyptus tessellaris, Hook., B.F1. iii. 251. 



"Moreton Bay Ash." This kino has the property of exuding 

 of a dark brown treacle colour, and soon becoming black without 

 any tint of red. According to Mr. Staiger, quoted by Dr. 

 Bancroft, it has a specific gravity of 1*35 and contains 71*7 per 

 cent of matter soluble in boiling water, and on cooling the solution 

 becomes turbid and deposits catechin. The portion insoluble in 

 water is soluble in alcohol, and the residue, when treated with 

 ether, leaves a dark coloured brittle mass identical with shellac, 

 possessing the same qualities both technically and chemically,* 

 and giving a good French polish of a rather darker colour than 

 the usual commercial article. This shellac constitutes about one- 

 fifth of the entire gum ; it is insoluble in benzine, kerosene and 

 the essential oils. The portion dissolved by ether forms a pliable, 

 reddish, transparent mass, which does not become dry, even after 

 four or five days. 



No. 66. " Moreton Bay Ash." " Wonkara " of Pt. Curtis. 

 Received from Mr. F. M. Bailey, Colonial Botanist, Queensland, 

 24th July, 1891. 



This kino is of a reddish-brown colour, is easily powdered 

 between the fingers, and the powder is of a light yellow colour. 

 Its general appearance at once indicates the group to which it 

 belongs. Its behaviour in water is much the same as that of E. 

 maculata. It was analysed August, 1891, with the following 

 result : — 



* This is erroneous. The resin is not more than a trace (I can find none 

 in my sample), but the catechin under some circumstances has a resinous 

 appearance. 



