(H3) 



2497- Black oak bark. — The bark of Quercus velutina Lam. {Fagaceae — Beech 

 Family). Native of eastern North America. 



2498. Black oak seeds. Quercitron. — The seeds of Quercus velutina Lam. {Faga- 



ceae — Beech Family). Native of eastern and central United States. 



2499. Acorns of European white, or English, oak. — The seeds of Quercus Robur L. 



Native of western Europe and cultivated. Presented by R. S. Williams. 



2500. Quercit. Acorn sugar (CeH7(OH) 6 ). — A sugar derived from the preceding 



and from other acorns. 



2501. Oak bark. — The bark of Quercus velutina Lam. Native of eastern United 



States. 



2502. Quercitrin. Quercitronic acid (C21H22O12 + 2H2O). — A glucoside, which 



is the yellow coloring matter of the bark of Quercus velutina Lam. 



2503. Cork.' — A tissue that constitutes much of the periderm of most barks. 



2504. Suberin. Cork-fat. (See No. 2401.) 



2505. Suberic acid (CeHi2 (COOH) 2 ). — An acid extracted from the preceding. 



2506. Galls. Nutgalls. Galla. (See No. 1347.) 



2407. Tannic acid. Acidum tannicum. Gallo-tannic or digallic acid (O4H10O9). — 



Tannic acid derived from the preceding and of exceptional purity. 



2408. The same, of ordinary medicinal quality. 



2409. Gallic acid. Acidum gallicum. Trioxybenzoic or trihydroxybenzoic acid 



(C7H6O6+H2O). — An acid derived naturally or artificially from the pre- 

 ceding. 



2510. Rhubarb. Rheum. Chinese or Turkish rhubarb. — The root of several 



species of Rheum (Polygonaceae — Knotweed Family). Used medicinally. 

 Native and cultivated in China. 



25 1 1. Rhein. Rheic or Chrysophanic acid. Rhubarb yellow (C1&H10O4). — An 



acid existing in and giving the yellow color to rhubarb. 



2512. Emodin. Trioxymethylanthraquinone (C16H10O&). — A principle giving the 



chief purgative property to rhubarb and a number of other cathartic drugs. 



2513. Raffinose. Mellitriose. Gossypose (C18H32O16 + 5H2O). — A sugar oc- 



curing in beets, cotton seed, and in other vegetable products. 



BUTTERCUP FAMILY (Ranunculaceae) 



2514. Pulsatilla. Pasque flower. — The herbage of Anemone Pulsatilla L, and 



A. pratensis L. Native of Europe. 



2515. Anemonic acid (QoHioOs). — An acid extracted from the preceding. 



2516. Anemonin. Anemonic or pulsatillic camphor (QoHsOj. — A camphor-like 



substance extracted from the preceding plants. 



2517. Staphisagria. Stavesacre. — The seeds of Delphinium Staphisagria L. 



Native of Africa and cultivated. 



2518. Delphinine (C22H36NO6). — An alkaloid extracted from the preceding. 



2519. Staphisagrine (C22H33NO6). — Another alkaloid from the same. 



2520. Delphinoidine (C42H68N2O7) . — Another alkaloid from the same. 



2521. Delphisine (C27LL2N2O4). — Another alkaloid from the same. 



2522. Black hellebore. Winter or Christmas rose. — Rootstock of Helleborus niger 



L. Native of Europe and cultivated for ornament. 



2523. Helleborein (CnHseOig). — A glucoside extracted from the preceding. 



