175 



matter by siib-acetate of lead, treat tlie filtrate with sulphuret of 

 hydrogen, remove the sulphide of lead and evaporate. — Vivid- 

 yellow powder, hygroscopic, of very bitter taste; softens at 55®, 

 completely liqiiifiedat 100°, is decomposed by more heat; dissolves 

 readily in water, also in alcohol, ether-alcohol, and in aqueous not 

 in pure ether; the aqueous solution evolves immediately on 

 heating the odour of ericinol (C20 Hie 02 ), while breaking up 

 completely into this substance and into sugar. 



Piuotanilic Aci(] = Ci4 Hg Og. Contained towai-ds midwinter 

 in the leaves of old trees of Pinus sylvestris and other true pines, 

 also in the green parts of Thuja occidentalis and allied trees. Is 

 obtained in the preparation of pinojjicrin [see this] as Pinotannate 

 of lead. Heat the liquid, from which the oxyi3inotannic acid has 

 been precipitated by acetate of lead, to the boiling point, precipi- 

 tate carefully with sub-acetate of lead, and let cool. Decompose 

 the washed precipitate with sulphuret of hydrogen, warm the 

 liquid together with the sulphide of lead, filter, and bring to dry- 

 ness in an atmosphere of carbonic acid gas. — Yellow-red; if pre- 

 pared from thuja, brownish-yellow powder; of slightly bitter and 

 acerb taste, becomes soft and glutinous at 100°, dissolves readily 

 in water, alcohol, and ether; does not precipitate glue, precipitates 

 chloride of iron with brown-red colour. By heating with diluted 

 acids, a red product is obtained. 



Pipeline C34 H19 NOe. Alkaloid of the fruit of Piper nigrum 

 and P. longum. Exhaust the powder with cold water, digest the 

 remnant with alcohol of 80%, evaporate the tincture to honey 

 consistence, wash with cold water, dissolve the residue in alcohol, 

 add a little hydrate of lime, digest for one day, filter and allow to 

 crystallise. — Colourless (if not quite pure yellow), glassy, flat, 

 klinorhombic prisms, almost tasteless (when yellow of pepper-like 

 taste), neutral, fusible at 110°, decomposed by more heat ; insoluble 

 in cold, little soluble in hot water, in 30 parts cold and in 1 part 

 boiling alcohol, in 100 parts ether, readily in acetic acid. 



Pipit zalioic Acid=C3o H20 O0 . Discovered by Pio de la Loza 

 in the Paiz (root) del Pipitzahuac, which comes from Perezia 

 Humboldtiana. Draw out with alcohol, evaporate, and purify by 

 recrystallising. — Tufts of gold-yellow, foliated crystals; fusible at 

 100°, and sublimable in gold-yellow leaflets; dissolves scarcely in 

 water, readily in alcohol and in ether; alkalies produce a purple 

 colour in the solutions, and yield amorphous compounds, which 

 dissolve readily in water, alcohol, and in ether. 



[PittOSporill. Glucosid of the bark and fruits of Pittosporum 

 undulatum. The pulverised bark is extracted with hot alcohol, 

 filtered when cold, mixed with an equal bulk of ether, filtered 

 again, and evaporated. — Whitish, loose powder of at first sweetish, 



