402 J. H. MAIDEN AND H. G. SMITH. 
- This exudation has the appearance of kino." When treated with 
alcohol the greater portion of the tannic acid goes into solution. 
This tannin gives a brownish green colour with ferric chloride, 
when a fairly strong solution of the kino is tested, but on sufficient 
dilution (in a very dilute aqueous solution), it gives a purple colour 
with the same reagent; an aqueous solution of the tannin was the 
material tested. The insoluble portion has the appearance ofa 
gum, but is insoluble in water on heating until a small quantity 
of dilute soda has been added. When the original substances 
treated with water the tannin dissolves, while the gum remains 
insoluble, but much swollen. This insoluble portion is soluble in 
dilute soda, and is precipitated on acidifying the solution, or on 
the addition of alcohol. It is thus found to be metarabin. The 
reactions and composition of this exudation show it to be identical 
with that yielded by the Ceratopetalums® and the exudations thus 
confirm the affinities of these trees belonging to different genera 
-of the Saxifragez. 
Gum Resins. 
Medicosma Cunninghamii, Hook. (N. O. Rutacez). 
The tree is locally known as “Glue Gum.” 
‘Collected at Mullumbimby, N. 8. Wales. 
This is a red, brittle, resinous substance with a very bright 
fracture, in small transparent pieces, and of a bright rather light, 
ruby colour. It is very brittle and readily powders, the colour 
cee CG OU) Se 
1 A number of our Eucalyptus and _ —_—- exudations of 
variable composition have been called “kinos,” because of their rese™ 
blance, more or less strong, to the en eout Rae of Pter 
marsupium, known in medicine as “kino.” The use of the term is co 
venient, and is used in these papers “ without prejudice.” It seems to™ 
-quite ee a Snags to coin anORHEr: term ~~ astringent exudar 
tions the original 
kino; we aleo look upon it as cundedeable, until very many more have 
been examined, and before those who lay stress upon nom menclatare of 
this kind are in a nese to select a suitable eh or terms. 
2 Ob tions on the gums yielded by two species of Ceratopetalum— 
Proc. Aust. Assoc. Aas. Sci., 11., 381, (1890). 
os 
