Contractions. - Chin. Chi. Cinchona officinalis. Nat. ord., Cinchonaceae. Synonyms. - Cinchona calisaya, C. flava. Fig. - Flora Horn., pl. 18.

Peruvian Bark. For. names: German, Chinarinde; French, Quinquina; Italian, China-china; Spanish, Guina.

Habitat. - South America.

Part employed. - The dried bark.

Characters. - Yellow bark. In flat pieces, deprived of periderm, rarely in coated quills, from 6 to 18 inches long, 1 to 3 inches wide, 2 to 4 lines thick, compact and heavy; outer surface brown, marked with broad, shallow, irregular longitudinal depressions; inner surface tawny yellow, fibrous; transverse fracture shortly and finely fibrous. Powder cinnamon brown, somewhat aromatic, persistently bitter.

Preparation. - Tincture, using rectified spirit.

Reference to Horn. Proving. - R. A. M. L., iii.

Proper forms for dispensing. - φ and upwards, Tincture, Pilules, or Globules.