Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. 17.—Wire cage. Fig. 18.—Cotton-plugged test-tubes. or a good quality of non-absorbent cotton), the cotton beingeasily sterilized and preventing the entrance of germs fromthe air. Tin-foil may be used to cover the cotton, or caps made ofindia-rubber. Test-tubes.—New test-tubes are washed with hydro-chloric acid and water to neutrahze the alkalinity often pres-ent in fresh glass, or in chromic acid cleaning mixture onehour. (Potassium dichromate, 6; water, 30; sulphu
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. 17.—Wire cage. Fig. 18.—Cotton-plugged test-tubes. or a good quality of non-absorbent cotton), the cotton beingeasily sterilized and preventing the entrance of germs fromthe air. Tin-foil may be used to cover the cotton, or caps made ofindia-rubber. Test-tubes.—New test-tubes are washed with hydro-chloric acid and water to neutrahze the alkalinity often pres-ent in fresh glass, or in chromic acid cleaning mixture onehour. (Potassium dichromate, 6; water, 30; sulphuric acid,46.) They are then well washed and rubbed with a brush PREPAKATION OF NUTRIENT CULTURE-MEDIA 67 placed obliquely to drain, and when dry, corked with cottonplugs. Then put in the hot-air oven (little wire cages, , being used to contain them) for fifteen minutes, afterwhich they are ready to be filled with the nutrient medium.(The cotton should fit firmly in the tube and extend a shortspace beyond it.) Test-tubes without flaring edges are more desirable, sincethe edges can easily be drawn out so as to
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1913
