Hemlock. Fig. 5.—Small portion of longitudinal-tangential

Fig. 5.—Small portion of longitudinal-tangential section of bark of Tsuga Mertensiana, magnified about 75 diameters.
s, cluster of stone cells;
cr, crystals of calcium oxalate;
m, m, medullary rajs;
r, oleo-resin cell.

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