Table III.
Results of the Bacteriological Examination of the Typhoid Water Supply for the year 1919.
Sample. Date. Total Colonies on Agar at 37°C. for 24 hours. MacConkey's Lactose Neutral Red Bile Salt Peptone Water. Presence of the Coli Group. 1 cc. 2 cc. 5 cc. 10 cc. 20 cc. 50 cc. Unfiltered, Filtered, 13-1-19. 740 40 Unfiltered, Filtered, 15-1-19. 50 660 ... Unfiltered, Filtered, 17-1-19. 30 664 Unfiltered, Filtered, 28-4-19. 30 800 Unfiltered, Filtered, 30-4-19. 40 800 Unfiltered, Filtered, 2-5-19. 50 760 Unfiltered, Filtered, 21-7-19. 20 800 Unfiltered, Filtered, 23-7-19. 140 880 Unfiltered, Filtered, 25-7-19. 50 660 Unfiltered, Filtered, 6-10-19. 17 753 Unfiltered, Filtered, Unfiltered, Filtered, 8-10-19. 10-10-19. 50 658 35 716 Presence of the Coli Group. + + + + + + 1 +1 + +++++++ 1 + 1 + 1+++ 1 + + + [ +++++++ + |+|+++++++ ++++ 1 +1 +1 +1 +1 +1 +1 +1 +4+1 +++ | | | | | + | + | + | + | + | + | +4¦ | | | + | +1 +1 +++ +++++++ +1 +1 + MacConkey's Classification of Coli Group. Group I in 1 cc. 3 in cc., 4 in 1 cc., 1 in 1 cc. Group I in 2 ccs. Group IV in 1 cc. Group II in 10 ccs. 1 in 20 ccs., 1 in 10 ccs., 4 in 10 ccs. Group III in 5 ccs. 1 Group IV in 10 ccs. 2 in 10 cc. Groups I & IV in 5 ccs. Negative up to 50 ccs. Group IV in 2 ccs. 4 in 10 ccs. Negative up to 50 ccs. Group IV in 2 ccs. 3 in 1 cc., 4 in 1 cc. Group IV in 50 ccs. 3 in 20 ccs., 4 in 20 ccs. Group not available. ++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; Acid only; No change.