Hemlock. Fig. 2.—Small portion of longitudinal-tangential

Fig. 2.—Small portion of longitudinal-tangential section of the inner bark of Tsuga Canadensis, magnified about 75 diameters.
a, a, medullary rays, the cells containing much starch;
b, b, stone cells;
c, row of cells containing crystals of calcium oxalate;
s, cell containing oleo-resinous secretion.

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