ig 61 
ae 
SG IES Spit ea eae ns a ee fait Fe 
KOH restores its solubility. Besides this, Eucalypt arabin is so 
closely united to the tannin and the colouring matter of the gum that 
by throwing it out these substances will go down for the most part 
too, united with it; and only the whole Eucalypt gum, or its anhydride, 
is obtained by the precipitation. In the same manner (nearly) all 
reagents which precipitate the tannin take the arabin down also. For 
Instance, sulphate of cinchonine precipitates the whole Siderophloia 
gum. Acetate of copper throws it to the bottom (if mixed in proper 
Proportions) very suddenly, leaving tho clear water in the bottle; 
reas, in a mixture of Acacia arabin and tannic acid, by the action 
of copper acetate, only the tannin is precipitated, being kept suspended 
atine unites with the 
d concent 
the gums of this group, is liable to alter them to metarabin, and to 
make them insoluble in water. In this manner old gums contained 
under the bark of the tree for many years become only soluble by 
(See sneric remarks.) The gum of this tree can be styled as 
99 gum of the. 3 
& ont cent. solution 1-029, It is generally found in large masses of 
net oF darker brown under the bark of the tree. It is very 
in ve ois i ies i 42°4 
EE nk ny a ee 30 
Phlobaphenes (and traces of ellagic acid) 21 
Mme Aid uk ee 23°5 
Impurities ase eee io aee ane ace 3 8 
100°0 
|Z: resinifera, Sm,, Fl, Austr. iii, 245. Jimmy Low. The gum 
t this tree agrees in most respects with that of L. siderophloia. It 
e 
bulky masses as the last-mentioned gum. 
ANALYysIs— 
Water., Ags me 
Arabin - i Se 
tarabin ae 
Phlobaphenes ~, 260 
Tannic acid 12 
G acid 3°6 
mpurities 
