. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . FiG. 54.— The corn Weevil (Calandra granaria).(Magnified and natural size). ever, dismissing the subject, certain abnormal con-ditions of the seed, which are brought about bysmall animal and vegetable parasites, should beconsidered. Those presenting minute round perforations, and con-sisting almost entirely of a shell, show that the seed hasbeen penetrated and its bulk removed by a small insect,visible to the naked eye,
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . FiG. 54.— The corn Weevil (Calandra granaria).(Magnified and natural size). ever, dismissing the subject, certain abnormal con-ditions of the seed, which are brought about bysmall animal and vegetable parasites, should beconsidered. Those presenting minute round perforations, and con-sisting almost entirely of a shell, show that the seed hasbeen penetrated and its bulk removed by a small insect,visible to the naked eye, termed calandra granaria {videfig. 54) and popularly known as the weevil. Those which are discoloured, and in which the bulkof their substance is replaced by a fine cottony material, CORN WHEAT FLOUR. 307 have been attacked by the ear-cockle or vibrio tvitici—a small worm-like parasite, pointed at either end asshown in figure Fig. 55.—Vibriones tritici X about 40. The acants farina is a small microscopic parasitewhich infests the grain, and closely resembles the acarusscabiei. It especially affects damp and inferior flour;
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