. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. EXAMINATION OF AIR, SOIL, AND WATER. 143 be examined by spreading the sand out in a dish and covering it with nutrient gelatine; or it may be shaken up with sterilised water and plate-cultivations prepared. The sand-filter nearest to the aspirator should remain free from bacteria. Sedgwick and Tucker employ a glass cylinder which is drawn out at one end into a narrow tube to contain sterilised powdered cane sugar. Both
. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. EXAMINATION OF AIR, SOIL, AND WATER. 143 be examined by spreading the sand out in a dish and covering it with nutrient gelatine; or it may be shaken up with sterilised water and plate-cultivations prepared. The sand-filter nearest to the aspirator should remain free from bacteria. Sedgwick and Tucker employ a glass cylinder which is drawn out at one end into a narrow tube to contain sterilised powdered cane sugar. Both ends of the apparatus are plugged with sterilised cotton-wool. By means of an exhausting apparatus a known volume of air is drawn through the tube. The cotton-wool plug is re- > Fig. 72.—Sedgwick and Tuckek's Tube. moved, and liquid gelatine is introduced into the cylinder, the plug is replaced, and the sugar is shaken into and quickly dissolves in the jelly. The cylinder is then treated in the same way as a roll-culture, and set aside for the colonies to develop (Fig. 72). Various forms of " aeroscopes " and " aeroniscopes " have from. Fig. 73.—Pouohet's Aekosoopk. time to time been employed. Pou chefs aeroscope consists of a small funnel, drawn out to a point below which is a glass slip coated with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Crookshank, Edgar M. (Edgar March), 1858-1928. Philadelphia, W. B. Saunders
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1897
