58 
The tannins of Lonchocarpus, Millettia, and of the Eucalypts of 
the said group appear to be totally identical. e reactions given by 
tannin solutions of Lonchocarpus and Millettia are exactly the same 
which take place with the respective Eucalypt gums to be described 
further on 
The tannin of the gum of LZ. Blackii is present at 75 per cent, 
yields pyrogallol by dry distillation and a yellow-red phlobaphene if 
boiled in dilute HCl. 
ANALYSIS— 
hr eyes te ssh Sc = sae fe Pe 38 
Resin soluble in ether, alcohol, chloroform, and benzol ... 14 
ic acid oe oie is a =e ie ee 742 
20°6 
100°0 
fillettia megasperma, F.v. M., Fl. Austr. ii. 211. The gum of this 
i i i dit to contain 
78 per cent. of tannin and 20 per cent. of water. It looks very pr . 
the Eucalypt gums of the ruby group. The fresh solution in C0: 
1 
tated with difficulty by alcohol on standing amounts to 3°5 oF 108 
The colouring phlobaphene is stained a deeper brown ee ee 
of L. Blackii and of the Euealypt gums to be mentioned turt : 
and the same is the case with the tannin contained in the Milletha gum a 
ANALYsIS—~ 
Arabin see me . 8D 
Resin oe ee ee 
Water Se gee eee 
Tannin oer toe of : eee eee eve 76 1 
100°0 
Evcabypr Gums ENTIRELY SoLUBLE IN WATER. rt : 
The Eucalypt gums which are entirely soluble in cold water, 
agree with each other in some essential respects. ; dal 
1, They all contain 15-20 per cent. of water in the air-dry ’ by 
_ 2, They all contain a tannin, which is stained delicately iat 
ferric salt, in a dilute solution. This tannin has ng by oy 
do- with kinotannic acid as it yields pyragallol Y 
distillation.* 
8. The phlobaphene, which forms the colourin matter és 
in al, al pink clout 
e 
ui 
ee: 
gums, is identical in all, giving a beautif 
meen cyanide of potassium (and with all alkalles ©” 
ess). ee 
'___* This was pointed out first by the writer in a paper read in Januarl: 
before the Aust, J for Advancement of Science (in Brisbane) eae 
# 
