244 AUSTRALIAN NATIVE PLANTS. 
and distinctly vesicular to the eye. It can readily be crushed 
between the fingers into a fine powder. It forms a yellow solu- 
tion in cold water, leaving a resinoid residue of a dirty brownish 
coiour, and much like soft toffee in appearance. On long 
continued digestion with water it loses its resinous. texture, and 
almost entirely dissolves. Its solubility varies very much accord- 
ing to its degree of freshness. The observations of different 
chemists in this respect can scarcely be reconciled in the absence 
of information in regard to the ages of the kinos, and particulars in 
regard to the trees which yielded them. According to Mr. Staiger, 
of Brisbane, this kino contains benzoic acid in an impure 
state, also catechin. “Like that of £. /esselaris, the insoluble 
portion of the kino treated with ether gives up a sticky substance, 
and leaves behind a clear, reddish, tasteless, brittle resin, having 
the properties of shellac.’”’ Mr. E. Norton Grimwade (Pharm. 
Fourn., 26th June, 1886) gives an account of some experiments 
with this kino. He found 7.07 per cent. of volatile constituents, 
consisting almost entirely of water, with the merest trace of a 
volatile oil, “to which the peculiar aromatic odour, strongly 
resembling styrol, possessed by the gum, is due.”” The quantity 
of this oil obtained was only two or three drops from three-quarters 
of a pound of kino. Unlike Mr. Staiger, Mr. Grimwade found 
no trace of benzoic acid, neither of cinnamic acid. The latter 
adds: “J tried the gum as a varnish, employing as solvents tur- 
pentine, methylated spirit, and linseed oil; the linseed oil and tur- 
pentine, I believe, practically dissolved nothing, but the methylated 
spirit yielded a hard, smooth, and transparent varnish.” Mr. Staiger 
gives the specific gravity of the kino at about 1.405, and the percent- 
age of tannic acid at 34.97. My own experiments with kinos, from 
different sources, up to the present, give percentages varying 
between 23 and 51. Mr. Grimwade (Joc. cz?.) finds the percentage: 
in his sample to be 10 per cent. of tannin, “ closely allied, if not 
identical, with querco-tannic acid.” 
Central New South Wales to Central Queensland. 
20. Eucalyptus microcorys, v.47, N.O., Myrtacez, B.FI., iii., 
212. 
