. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 226 CIVIC BIOLOGY plug the test tubes. To make plugs, tear a strip of cotton about two inches \yide and as long as needed, fold length- wise, and roll into a plug. Insert this not more than half an mch into the test tube. Cotton plugs are quite generally used in bacteriological work, since they allow a free circu- lation of air and prevent the entrance of germs. If material. Fig. 105. Preparing culture media Photograph hy the author is properly sterilized and plugged with cotton, i
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 226 CIVIC BIOLOGY plug the test tubes. To make plugs, tear a strip of cotton about two inches \yide and as long as needed, fold length- wise, and roll into a plug. Insert this not more than half an mch into the test tube. Cotton plugs are quite generally used in bacteriological work, since they allow a free circu- lation of air and prevent the entrance of germs. If material. Fig. 105. Preparing culture media Photograph hy the author is properly sterilized and plugged with cotton, it will keep indefinitely. (8) Do not open the hot-air sterilizer until the temperature is down to 40° or 45° C. It is preferable to leave the dishes undisturbed in the sterilizer until used. Before planting (inoculating) your culture media with bacteria observe the followinof: Unless otherwise directed, always inoculate media with platinum loop or needle. (1) Heat the wire in the flame just before and immediately after using. (2) Avoid having. 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 Hodge, Clifton Fremont, 1859-; Dawson, Jean, 1873-. Boston, Ginn
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