2. Alcoholic solution yellow. Lead acetate produces a precipitate—Ye/tow Xantltorrhoea _Resin. Imperfectly soluble in alcohol.
1. Alcoholic solution gives with ammonia a clear mixture.
a. Ammoniacal mixture is violet. Lead acetate gives a violet precipitate—Lac.
b. Ammoniacal mixture is yellow or colourless.
Perchloride of iron colours the alcoholic extract black. Lead acetate gives no pre cipitate—Gamboge.
Perchloride of iron gives a precipitate which is neither soluble in ether nor by heating. Lead acetate gives a precipitate.
i. Readily and completely soluble in ether-alcohol.
ii. Bromine solution precipitates the resin from the chloroform solution—Austratian Copal.
Bromine solution produces no precipitate—Manilla Copal.
iv. Imperfectly soluble in ether-alcohol—E. Indian and African Copal.
2. The alcoholic solution gives with ammonia a turbid mixture.
Perchloride of iron gives a precipitate that is neither dissolved by boiling nor in ether— . .Borneo Copal.
b. Percbloride of iron gives no precipitate.
a. Completely soluble in ether-alcohol. Chloral test colours evaporation-residue of petroleum-spirit extract blue to blue-violet--Liquidambar styraciflua Balsam.
/3. Incompletely soluble in ether-alcolaol.
t The drug contains sulphur.
i. Yields umhelliferone by dry distillation.
ii. Hydrochloric acid colours the evaporation-residue of the petroleum-spirit extract reddish-yellow ; the chloral test colours it green—Persian Sagapenum.
iii. Hydrochloric acid colours the residue blue-violet ; chloral test colours it rose-colour to raspberry-red and violet—Levant Sagapenum.
iv. Not coloured by hydrochloric acid. The solution of the drug in sulphuric acid is yellow-brown with a blue fluorescence. Potassium nitrate colours the gum-resin malachite-green—Ordinary Asafcetida.
v. Yields no umbelliferone by dry distillation.
vi. Sodium carbonate solution colours the drug light-brown, and the extract is not altered by acetic acid or lead acetate—Asafcetida from Ferala alliacea.
vii. Sodium carbonate solution forms an emulsion that cannot be filtered.
viii. Lead acetate gives no precipitate. Iodine solution is not altered—Indian Bdellium.
ix. Lead acetate produces immediately or after a short timo a precipitate that dissolves upon warming. Iodine solution is not altered—African Bdelliam.
ft The drug contains no sulphur.
i. Yields umhelliferone by dry distillation.
ii. The evaporation-residue of the petroleum-spirit extract is coloured by hydrochloric acid and the chloral test.
fii. Hydrochloric acid colours reddish-yellow ; the chloral test colours green—Per'stan Galbanum.
iv. Hydrochloric acid colours red-violet ; the chloral test colours greenish—Levant Gal. banum as at present in commerce.
v. Hydrochloric acid colours violet-blue ; the chloral test carmine-red—Older Specimens of Levant Galbanum.
vi. Hydrochloric acid gives no colour ; the chloral test colours light-brown—African Ammoniacum.
vii. Yields no umbelliferone by dry distillation.
viii. Chloride of limo solution colours the gum-resin orange-yellow—Persian Ammonfacum.
ix. Chloride of lime solution produces no colour. Lead acetate gives no precipitate.
x. Iodine solution is not altered ; the chloral test colours greenish—Olibanum.
xi. Iodine solution is not altered; the chloral test gives no colour—Indian Myrrh.
xii. Chloride of lime solution produces no colour. Lead acetate gives a precipitate.
xiii. Bromine solution oolours violet-red ; the chloral test colours violet—Ordinary Myrrh.
xiv. Bromine solution produces no colour or only yellowish. Perchltuide of iron colours green— Opoponax.
xv. Bromine solution produces no colour or only yellowish. Perchloride of iron colours brownish—Eupluirbiurn.
Itirnmarumms.—This group includes all plant-substances which, in physical characteristics, resemble or approach indiarubber. The physical properties of indiarubber are so remarkable and peculiar that it is difficult to mistake whether a plant Menge to this group or not. It comprises the various kinds of indiarubber, guttapercha, balata, dm. These products have hitherto been obtained exclusively from the milky saps of certain plants. This milk is not confined to the plants affording supplies of indiarubber, but occurs also in members of other families, as the Papaveracece (Papaver somniferum, or opium-pnppy) and the milky Composita3 (Lactuca, Sonchus).