. Bacteriological methods in food and drugs laboratories : with an introduction to micro-analytical methods . Bacteriology; Food; Drugs. TECHNIQUE 87 than 50 per cc, it would be desirable to use i cc. quantities for plating which would give about 50 colonies in the plate. The thorough mixing of the sample before making the dilutions is of the greatest importance, likewise the thorough mixing of each dilution before taking out the quantity to be'plated. Each. B - J 1 V 7 1 s Fig. 23.—Types of growth in stab cultures. A, Non-liquefying, i, Filiform (Bacillus coli); 2, beaded (Streptococcus pyoge
. Bacteriological methods in food and drugs laboratories : with an introduction to micro-analytical methods . Bacteriology; Food; Drugs. TECHNIQUE 87 than 50 per cc, it would be desirable to use i cc. quantities for plating which would give about 50 colonies in the plate. The thorough mixing of the sample before making the dilutions is of the greatest importance, likewise the thorough mixing of each dilution before taking out the quantity to be'plated. Each. B - J 1 V 7 1 s Fig. 23.—Types of growth in stab cultures. A, Non-liquefying, i, Filiform (Bacillus coli); 2, beaded (Streptococcus pyogenes); 3, echinate (Bacterium acidi lactici); 4, villous (Bacterium murisepticum); $, arborescent (Bacillus mycoides). B, Gelatin liquefying. 6, Crateriform (Bacillus vulgare, 24 hr.; 7, napiform (Bacillus subtilis, 48 hr.); 8, infundibuliform (Bacillus prodigiosus); 9, saccate (Microspira finkleri); 10, stratiform (Pseudomonas fluorescens).—(McFarland, ajter Frost.) test should be made in triplicate, taking up the i cc. amounts for making the dilutions with three different clean sterile pipettes. It is preferable to use a new pipette for each dilution. If it is not convenient to have on hand a sufficient number of clean sterilized pipettes, the pipette in use must be thoroughly. 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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