. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). 296 BACTERIA, YEASTS, AND MOLDS Method of Experimenting. The order in which the experiments are given is the one which most naturally follows the subjects treated in the body of the text, and should be followed as closely as possible. Where possible each scholar should perform the experiments, but this will be found imprac- ticable in most cases. In such cases the experi- ment must be performed by the teacher in the presence of the class. Most experiments with microorganisms require two or three days for the ba
. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). 296 BACTERIA, YEASTS, AND MOLDS Method of Experimenting. The order in which the experiments are given is the one which most naturally follows the subjects treated in the body of the text, and should be followed as closely as possible. Where possible each scholar should perform the experiments, but this will be found imprac- ticable in most cases. In such cases the experi- ment must be performed by the teacher in the presence of the class. Most experiments with microorganisms require two or three days for the bacteria to grow, and the observations must therefore be made some time after the prepara- tion is made. Hence it is especially important that everything should be carefully and intel- ligibly labeled and that the scholars understand the meaning of the labels. When the teacher performs the experiments the scholars should see the preparation as well as the final results, and each scholar should make careful notes. Sterilizing. All glassware must be sterilized before it is used. This is abso lutely necessary and the success of the experiments will depend upon it. The glassware should be first washed clean. Then all test tubes, flasks, and fermenta- tion tubes should be tightly plugged with cotton, as shown in Figs. 38 and 64, and then placed, with all other glass apparatus, in the dry sterilizer. By means of a Bunsen flame the sterilizer should then be heated to a temperature of about. Fig. 82. Hot-air sterilizing 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 Conn, H. W. (Herbert William), b. 1859. Boston, New York, Ginn and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1917
