. Bacteriology and mycology of foods. Food. HYGIENIC LABORATORY METHOD 153 Table XII—Continued (FOR DILUTIONS)™-STOCK 1 PER CENT SOLUTION [Ice Disinfectant+09 cc Distilled Water = Solution B] 1800 = 2000 = 2200 = 2400 = 2600 = 2800 = 3000 = 3200 = c c of B 5 5 5 5 5 5 5 5 + + cc dist water 85 or 95 or 105 or 115 or 125 or 135 or 145 or 155 or c e of B 4 4 4 4 4 4 4 c c dist water 68 76 84 92 + 100 + 108 + 116 + 124 c c of or 2 or 2 or 2 or 2 or 2 or 2 or 2 + + + c c dist water 34 38 42 46 50 54 58 62 Subculture Tube Racks. Wooden racks, with 5 rows of 14 holes each, are used for holding the su
. Bacteriology and mycology of foods. Food. HYGIENIC LABORATORY METHOD 153 Table XII—Continued (FOR DILUTIONS)™-STOCK 1 PER CENT SOLUTION [Ice Disinfectant+09 cc Distilled Water = Solution B] 1800 = 2000 = 2200 = 2400 = 2600 = 2800 = 3000 = 3200 = c c of B 5 5 5 5 5 5 5 5 + + cc dist water 85 or 95 or 105 or 115 or 125 or 135 or 145 or 155 or c e of B 4 4 4 4 4 4 4 c c dist water 68 76 84 92 + 100 + 108 + 116 + 124 c c of or 2 or 2 or 2 or 2 or 2 or 2 or 2 + + + c c dist water 34 38 42 46 50 54 58 62 Subculture Tube Racks. Wooden racks, with 5 rows of 14 holes each, are used for holding the subculture tubes, and as plants are made from each mixture of culture and disinfectant every 2\ minutes up to fifteen minutes, 6 tubes are required for each dilution. Thus, in each rack we have 10 rows of 6 tubes each with 2 empty cross rows of. Fig. 43.—^Block for Subculture Tubes. holes remaining, which are utiHzed by placing over in the next row each tube as it is planted. This makes it easy to keep run of the tubes that are planted. It is well also always to plant from the seeding tube in a certain hole in the water bath into a certain row of tubes in the rack. This, after a little practice, will help to avoid errors m planting. Method of Conducting the Test. If there are in one experiment more than 10 dilutions of the disinfectant, including the phenol controls, the stronger solutions of the disinfectant and phenol are tested first, as it will not be necessary to plant them after seven and a half minutes. The weaker solutions are then immediately done and are then planted every two and a half minutes for fifteen minutes. For keeping the time a stop watch can be used, but an ordinary watch will serve the same purpose by simply starting on the two-and- one-half- or five-minute 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 perfe
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