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.

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