. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . water, turns pinkwith iodine, but any potato starch present changesthis to a purple. I. Large, round or oval grannies, more or less flattened, andshowing no marked stricd; together with others extremelysmall and ill-defined. May he wheat, barley or rye. j]7/^^^^._Few, if any, intermediary- sizes, although * A term used, in this connection, to denote a size about midwaybetween that of the large and small granules. 2>?>2 LAB
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . water, turns pinkwith iodine, but any potato starch present changesthis to a purple. I. Large, round or oval grannies, more or less flattened, andshowing no marked stricd; together with others extremelysmall and ill-defined. May he wheat, barley or rye. j]7/^^^^._Few, if any, intermediary- sizes, although * A term used, in this connection, to denote a size about midwaybetween that of the large and small granules. 2>?>2 LABORATORY WORK. the larger granules themselves vary somewhat in size.(A linear hilum and strise are visible under a highpower, and the small granules are seen to be angular). Barley.—Similar, but whereas the large granules aremore uniform in size, they are rather more irregular inshape and somewhat smaller, and intermediary sizes Fig. 62.—Wheat X 200. Fig. 63.—Barley X 200. are more commonly present. Striae are slightly dis-cernible sometimes in the larger cells. Rye.—Similar, but many show a rayed hilum andpresent cracked edges; the granules are somewhat. Fig. 64.—Potato X 200. larger, and more generally circular and flattened, thanthose of wheat or barley. 2. Large, pynfovm or oval gramdes, with well-marhed con-centric stria, and a circular or linear he potato or —Typically, they have the appearance of an STARCH GRANULES. 333 oyster-valve. A well marked circular or stellate hilumis at the smaller extremity, and the strise, starting andending at the hilum, are well marked. They varyconsiderably in size. —Similar, but the hilum is generally at the
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