. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. 77.—Rye. Tissue from the • testa of the grain, showing theappearance of the cells which form its outer and inner membrane.(X 100). rather than to the starch granules that one must turn inorder to discriminate between wheat and barley. In rye the testa so closely resembles that of wheatthat it is difficult to hit upon a point in which • they STARCH GRANULES. 339 differ, and it is fortunate that the starch grains afford aread
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. 77.—Rye. Tissue from the • testa of the grain, showing theappearance of the cells which form its outer and inner membrane.(X 100). rather than to the starch granules that one must turn inorder to discriminate between wheat and barley. In rye the testa so closely resembles that of wheatthat it is difficult to hit upon a point in which • they STARCH GRANULES. 339 differ, and it is fortunate that the starch grains afford aready means of distinguishing between the two. It may be pointed out that the unicellular hairs aresomewhat shorter than in wheat. In maize (Indian corn) the envelopes are two in num-ber ; the external consists of several superimposedlayers of flattened elongated cells, and the internal ofa layer of cells of irregular size and shape, but other-wise resembling the internal layer of wheat. What isvery characteristic, however, about maize is that thecellular network, which holds the starch granules, in.
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