76 
The resin was thought by Mr. Staiger to be identical with shellac, 
to which it bears much resemblance, being insoluble in benzol, but it 
has nothing to do with shellac at all. It softens very much in water; 
and really a part of it, consisting of tannin, is redissolved and stained 
blue by ferric salts and pink by KOH. a dissolves freely in ether, 
where the Alpha and Beta resin ei shellac are quite insoluble. It 
dissolves in acetic ether which does not affect shellac. Finally, it 
is dissolved by weak KOH with Jets yellow colouration, and under 
the microscope radiating crystal groups of glaucomelanate of potassium — 
are ae to be formed. | 
alkaline solution is stained blue-black by ferric salt after 
ee ates with HCl. This shows plainly that ee substance in 
question must be recognised as a resinous body derived from — 
tannate and as a relation of ellagie acid, as similar resins have — 
been shown by Schlagdenhauffen (1891). Dry distillation yields 
pyrogallol. 
ananye ou April, 1895)— 
ae 12°0 
dg or cenadseg ; Se at | 
Arabin and metarabin ... o a ; iva | 
Phistapee up i in tan resin... oe. es ) 
‘Aromatio w substance (styrol 2)". es tacos | 
995 
Euca a ge ard F. y. M., Fi. Austr. iii. 212. ep! 
wood. Yields exudation very ric ch in tannin. It is soluble 8 - 
water to a ae extent. The decoction looks ‘turbid, and deposits § 
ent sediment amounting to 12 per cent. of the gum the 
After elimination of the insoluble part, the clear solution giveste 
following reactions :—Ferric acetate, blue gic daa turned poe fy 
onia. Ferricyanide of potassium in ammonia, pea we : 
vermilion, turned in brown on standing. KOH, picks sng a ] 
a pa le picts on. Ammon. m neha in 3. tarps 
dark-brown, cupric emake a light-brown, precipitate, te a 
yellow-brown or greenish-brown on addition of ammonium a 
m 
Antimon. tartar. makes no precipitate unless NH,Cl 1 dded, ; 
ces a yellow-brown pee ipitate. Th f’ the lead galts . 
greenish-yellow. oe albumen, and sulphate of cinchonine 1 
es is are exactly the same as produced in th? 
solution of the tan-resin gum of Euealyp a ede 2 F. ¥. on ost 
The residue left undissolved in water is partly, soluble in 
ome takes up the resin, the tannin embodied in it, and the, 
in water and alcohol. The saat ebm of ellagic 4 
skeleton of metarabin. A ellagi ¢ acid is Lioeayt in col ee 
