. Bacteriological methods in food and drugs laboratories : with an introduction to micro-analytical methods . Bacteriology; Food; Drugs. STANDARDIZATION OF DISINFECTANTS 239 ning crosswise represent the same strength dilution, while the rows running lengthwise represent the different strengths to be used in the experiment. Starting with the lowest dilution {, the strongest), the cyKnder is shaken, then 5 cc. are measured into the tubes of the row to receive that strength, using a 5 cc. delivery pipette. In order to economize glassware, the same pipette is used for measuring out the next di
. Bacteriological methods in food and drugs laboratories : with an introduction to micro-analytical methods . Bacteriology; Food; Drugs. STANDARDIZATION OF DISINFECTANTS 239 ning crosswise represent the same strength dilution, while the rows running lengthwise represent the different strengths to be used in the experiment. Starting with the lowest dilution {, the strongest), the cyKnder is shaken, then 5 cc. are measured into the tubes of the row to receive that strength, using a 5 cc. delivery pipette. In order to economize glassware, the same pipette is used for measuring out the next dilu- tion, first blowing out as much of the remaining liquid as possible, then drawing a pipette full of the next dilu- tion to be used and discard- ing that, then filling the pipette a second time, which is then emptied into the seed- ing tube. The measuring out being completed, the tubes are placed in the water bath and allowed to stand a few minutes in order that the disinfectant solution may reach the stand- ard temperature. We have not found it necessary to use cotton plugs in the seeding tubes. They are sterilized in paper-lined wired baskets, with the closed end of the tubes up. Subculture Tube Racks.—Wooden racks, with five rows of. LH WILDER Fig. 85.—Water bath showing position of holes for the thermometer and the seeding tubes.—f^Anierson &" McCUntie, Hygiene Laboratory Bulletin No 82, U. S. Public Health Service.). 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 Schneider, Albert, 1863-1928. Philadelphia : P. Blakiston's Son & Co.
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