Table IV.
Results of the Bacteriological Examination of the Fokfulum Water Supply for the year 1917.
Rate of Filtration Date Total Colonies on Agar in 24 hours Presence of the Coli Group, MacConkey's Lactose Neutral Red Bile Salt Peptone Water cc. 1 cc. 2 cc. 5 cc. 10 cc. 20 cc. 50 cc. Unfiltered, 8-1-17. 8-1-17 300 + + + + + + Filtered, 8-1-17. 8-1-17 30 谷生 + + + + + Unfiltered, 10-1-17. 10-1-17 5 + + + + + + Filtered, 10-1-17. 10-1-17 294 + + + + + + Unfiltered, 12-1-17. 12-1-17 10 + + + + + + Filtered, 12-1-17. 12-1-17 294 + + + + + + Unfiltered, 16-4-17. 16-4-17 50 + + + + + + Filtered, 16-4-17. 16-4-17 500 + + + + + + Unfiltered, 18-4-17. 18-4-17 35 + + + + + + Filtered, 18-4-17. 18-4-17 546 + + + + + + Unfiltered, 21-4-17. 21-4-17 45 + + + + + + Filtered, 21-4-17. 21-4-17 358 + + + + + + Unfiltered, 9-7-17. 9-7-17 95 + + + + + + Filtered, 9-7-17. 9-7-17 500 + + + + + + Unfiltered, 11-7-17. 11-7-17 60 + + + + + + Filtered, 11-7-17. 11-7-17 550 + + + + + + Unfiltered, 13-7-17. 13-7-17 40 + + + + + + Filtered, 13-7-17. 13-7-17 375 + + + + + + Unfiltered, 1-10-17. 1-10-17 80 + + + + + + Filtered, 1-10-17. 1-10-17 500 + + + + + + Unfiltered, 3-10-17. 3-10-17 70 + + + + + + Filtered, 3-10-17. 3-10-17 600 + + + + + + Unfiltered, 5-10-17. 5-10-17 85 + + + + + + Filtered, 5-10-17. 5-10-17 10 + + + + + +Group III in 20 ccs. Negative up to 50 ccs. Negative up to 50 ccs. Group III in 20 ccs. Group III in 50 ccs. Group III in 1 cc. Group III in 2 ccs. Group III in 5 ccs. Group III in 20 ccs. Groups III & IV in 1 cc. Group III in 50 ccs. Groups III & IV in 1 cc. Group IV in 50 ccs. Group III in 2 ccs. Group III in 20 ccs. Group III in 5 ccs. Negative up to 30 ccs. Groups III & IV in 1 cc. Group III in 50 ccs. Group III in 1 cc. Group III in 50 ccs. Group III in 2 ccs. Group III in 50 ccs.
All samples taken either immediately before or immediately after filtration. The rate of filtration is given by the Water Authority in gallons per square yard per day. Classification of the Coli Group is that of MacConkey, + Acid and Gas ; 1 = Acid only ; = No change.
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