AnnualReport-1919 — Page 322

Table IV.

Results of the Bacteriological Examination of the Pokfulum Water Supply for the

Rate Total Colo-

nies on

MacConkey's Lactose Neutral Red Bile

Salt Peptone Water.

year 1919.

of

Sample.

Date.

Agarin 1 cc

Filtra-

Presence of the Coli Group.

at 37° C. for

tion.

24 hours.

cc.

1 cc.

2 cc. 5 cc. 10 cc. 20 cc. 50 cc. Unfiltered, 13-1-19. 50 Filtered, 13-1-19. 325 10 Unfiltered, 15-1-19. 70 Filtered, 15-1-19. 325 20 Unfiltered, 17-1-19. 35 Filtered, 17-1-19. 325 3 ... Unfiltered, 28-4-19. 50 Filtered, 28-4-19. 400 20 Unfiltered, 30-4-19. 35 Filtered, 30-4-19. 400 10 Unfiltered, 2-5-19. 40 Filtered, 2-5-19. 400 20 Unfiltered, 21-7-19. 80 Filtered, 21-7-19. 400 20 Unfiltered, 23-7-19. 100 Filtered, 23-7-19. 400 20 Unfiltered, 25-7-19. 100 Filtered, 25-7-19. 700 30 Unfiltered, 6-10-19. 50 Filtered, 6-10-19. 560 25 Unfiltered, 8-10-19. 170 Filtered, 8-10-19. 294 50 Unfiltered, 10-10-19. 450 Filtered, 10-10-19. 820 60 + 1 + 1 + 1 + 1 + 1 + 1 +1 +1 +1 +1 +1 +1 1 1 +1 +++ 1 + 1 +1 +1 +1 +1 |+| | | + | + | +! + 1 + 1 + 1 ++++++ 1 + + + { +++++++++++ 1 +++++ |+|+++ ++++++++++++++++ +++

Group IV in 20 ccs.

Group IV in cc. Group IV in 50 ccs. Groups III & IV in 2 ccs. Negative up to 50 ccs.. Group IV in 2 ccs.

Group III in 20 ccs,

Group III in 1 cc.

Groups III & IV in 20 ccs. Group IV in 2 ccs. Group III in 50 ccs,

4 in 1 cc., 2 in 1 cc.

4 & 2 in 20 ccs., 2 in 10 ccs.

2 in 50 ccs.

4 in 10 ccs., 4 in 20 ccs.

2 in 1 cc.

1 in 20 ccs., 1 in 10 ccs.

MacConkey's Classification of Coli

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.

M 75