Fig. 328, 329, 330. Bark of Cinchona
Calisaya entirely deprived of periderm. Short-fibrous fracture of liber.
Bark of C. scobiculata. Stringy fracture of liber.
Bark of C. pubescens coated externally by its periderm. Smooth or suberous fracture of the external or purely cellular portion of the bark. Ligneous fracture of the internal portion or liber.
This image is from _ in Pereira's Elements of Materia Medica and Therapeutics, 1854.