36 
2. Resin drying up soon after it is exuded. (Hard resins.) 
a. Watery infusion of the resin yellow, exhibiting a a | 
and very strong blue fluorescence, w ich is des 
instantly on addition of the slightest trace of aid He 
salt. Evodia alata, F. v. M. 
B. Watery infusion of the resin pale, not exhibiting any fluor 
a 
ammonia. Caustic mek gives a beautitu 
reaction with the Blog olic solution. Recerca 
R. B 
bb. 
ao 
r. 
Alcoholic solution dark brown, altered by ferric chloride 
into grey black, which is restored to dark b k brown 
addition of ammonia. Caustic potash cha hanges the | 
dark brown of the alcoholic solution into yellow brow! 
Myoporum platycarpum, R. Br ] 
b. Resin insoluble in chloroform or nearly insoluble; 
alcoholic solution pale yalon or <etontleats not brow! | 
aa. Resin in form of tears with a mealy surface, Ve 
brittle and easily powdered. No trace of mth 1, 
Caustic potash colours the alcholic ers : q 
golden yellow. Essential seen disti ss Calliti 
ealcarata, R. Br. 
bb. Resin tough, not mealy on the pore 
Caustic potash produces a pale ye 
alcoholic solution. . 
1. Resin in large masses like a man’s yeaa 
resembling the New Zealand copal, very inside, 
on the surface, but of a a yellow oil, dit 
taining only traces of a sential Oy is 
tilled off the resin, sinatle Tike "ore Cary pei Ba 
fossil. Gao “ Copal’). athis ; 
Benth and Hook. 
2. Resin in ats pieces, containing spells 
rabin. Essential oil, distilled oe the resid, roast’) 
like Oleum Petroselini. (Quee and “ De 1 
Agathis robusta, Benth, and Stock Be 
.—GUMS. ured 7 
AA, Astrrvorxt Gums,—Dilute watery solution coloured 6° 
or a on addition of ferric acetate. 
Out of the watery solution the whole gum is precip! 
eet black (gelatinising) mass on addition of row 
(Brigalow Gum from) Acacia harpophylla, . 
nor Gum im precipitated out of the (dilute) vietosted 2 
