(U7) 



2610. Acetic acid (CHjCOOH).— The acid of vinegar, largely made from apple 



juice by fermentation and obtained from many other vegetable substances. 

 It is not a proximate principle, but a derivative product. 



261 1. Apple-tree bark. — The bark of the root of the apple tree. 



2612. Phloridzin. Phlorrhizin (G21H24O10+2H2O).— A glucoside from the preced- 



ing; also found in the root bark of the pear, plum, cherry, and other trees. 



2613. Bitter almond. Amygdala amara. (See No. 1352.) 



2614. Wild cherry bark. Prunus virginiana. — The bark of Padus virginiana (L.) 



Mill. {Amygdalaceae— Peach Family.) Native of eastern North America. 



2615. Amygdalin (C20H27NO11+3H2O).— A glucoside existing in the two preceding 



and in related plants that yield prussic acid on fermentation with water 

 and a suitable enzyme. 



2616. Emulsin. — A substance extracted from the same plant substances that yield 



the preceding, and containing the enzyme or ferment that causes the 

 production of prussic acid from their amygdalin. 



2617. Amygdalic acid (C 8 H 8 3 ). — A derivative acid that can be made from the 



same vegetable substances that yield the preceding. 



2618. Conglutin. — An albuminous substance or casein existing in sweet and bitter 



almonds. 



2619. Acacia. Gum arabic. — A gum exuding from several species of Acacia 



(Mimosaceae — Mimosa Family) growing in northern Africa and adjacent 

 regions. 



2620. Arabic acid (CeHioOstkO). — An acid that largely composes the preceding 



gum. 



2621. Erythrophloeum. Sassy-bark. — The bark of Erythrophloeum guineense 



Don. (Same family). Native of tropical Africa and used as an arrow- 

 poison. 



2622. Erythrophleine hydrochloride. The hydrochloride of an alkaloid of unde- 



termined chemical composition, extracted from the preceding. 



2623. Catechu. (See No. 1363.) 



2624. Catechu-tannic acid. — A form of tannic acid contained in the preceding. 



2625. Catechin. Catechuic acid (C21H20O9+5H2O).— An acid extracted from 



Catechu. 



2626. Protocatechuic acid. — Another acid having the same origin. 



2627. Brazil wood. (See No. 1280.) 



2628. Brasilin (GeHuOs) — The coloring matter of the preceding. 



2629. Copaiba. Canima. — An oleo-resin found in cavities in the trunk of various 



species of Copaiba. (Same family). Native of tropical America and 

 Africa. 



2630. Resin of Copaiba. — The resin extracted from the preceding. 



2631. Copaibic acid. A purified form of the preceding, but of indefinite chemical 



composition. 



2632. Logwood. Haematoxylon. (See No. 1282.) 



2633. Haematoxylin (GeHuOeHzO). — The red coloring matter of logwood. 



2634. Kino. — The inspissated juice of the trunk of Pterocarpus Marsupium Roxb. 



(Same family). Native of the East Indies. 



2635. Red Saunders. Red sandalwood. Santalum rubrum. 



2636. Santalin. Santalic acid (G4H14O5). — The red coloring matter of the pre- 



ceding. 



