Hemlock. Fig. 1.—Small portion of cross-section of bark

Fig. 1.—Small portion of cross-section of bark of Tsuga Canadensis, magnified about 50 diameters.
c, c, c, secondary cork formation;
a, dead phloem tissues rich in coloring, resin and tannic matters;
s, s, stone cells;
m, m, medullary rays;
cr, crystal cell;
ca, cambium.

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