BY J. H. MAIDEN. 421 



No. 69. Sample received from Mr. Charles Moore, Botanic 

 Gardens, Sydney, 29th December, 1887. 



This sample is the lightest in colour and most vesicular. 

 Colour sienna-brown with a tinge of olive. Colour of powder 

 raw sienna. 



Cold water yields a solution of the tint of fresh and pure olive 

 oil ; the residue, of the colour and consistence of plastic sulphur, 

 and adheres only very slightly to the vessel. 



Treatment with hot water dissolves this substance rather 

 readily, leaving a very small quantity of dirty yellowish-white 

 powder. Water at 100° C (1 grm. to I litre) yields a very 

 turbid liquid of a very light yellowish tint. 



It was analysed October, 1888, with the following result: — 

 Catechin and tannic acid .. . .. 84 '9 



Ligneous matter, &c. ... ... -9 



Moisture ... ... ... ... 14-0 



Ash "2 



100-00 

 Tannic acid determination (Lowenthal) 30*984 per cent. 

 No*. 70. Sample received from Mr. F. M. Bailey, Colonial 

 Botanist, Queensland, February, 1888. 



Second in depth of tint, very like No. 67, but slightly lighter. 

 To cold water it yields a lemon-coloured solution rather paler 

 than any of the others. To water at 100° C it yields a light 

 brownish liquid, very turbid and very difficult to completely 

 dissolve. Alcohol (B.P. tincture strength) yields a very dark 

 olive-brown liquid. 



It was analysed, October, 1888, with the following result : — 

 Catechin and tannic acid ^.. ... 81*3 



Ligneous matter, &c. .. ... 2-0 



Moisture 10-3 



Ash 6-4 



100-00 

 Tannic acid determination (Lowenthal) 27-926 per cent. 



