Fig. 114. Quillaja - Cross-section of bark.

Fig. 114. Quillaja - Cross-section of bark.

(25 diam.) A. Medullary ray. B. Bast fibers and stone cells. (Photomicrograph.)

This image is from Soapbark in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.