Fig. 5.—Cross section of stem bark of Prunus Mahaleb.

Fig. 5.—Cross-section of bark of Prunus Mahaleb magnified about 75 diameters.
a, cork exfoliating from exterior surface;
b, secondary cork formation farther interior;
c, fissure in cortex;
d, primary bast fibres in outer portion of bast layer;
e, compressed sieve tissue;
f, single bast fibre. (A few scattered bast fibres occur in the secondary bast in this species.)
g, medullary ray;
h, compressed sieve tissue;
i, newly formed bast;
k, cambium zone;
l, large duct in newly formed wood;
m, wood of previous season.

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

Fig. 5.—Cross section of stem bark of Prunus Mahaleb.