Prunus. Fig. 12.—From longitudinal tangential section of inner bark of Prunus Pennsylvanica.

Fig. 12.—Portion of longitudinal tangential section of inner bark of P. Pennsylvanica magnified about 75 diameters.
a, medullary ray;
b, soft bast cell;
c, bast fibre;
d, crystal cell.

This image is from Structure of our Cherry Barks in the September issue of the American Journal of Pharmacy, 1895.

Fig. 12.—From longitudinal tangential section of i...