HONGKONG.
No. 20
1911
REPORT ON AN INVESTIGATION OF THE POKFULUM WATER SUPPLY BY THE GOVERNMENT BACTERIOLOGIST.
Laid before the Legislative Council by Command of His Excellency the Governor, December 21st, 1911.
Introduction,
CONTENTS.
The Pokfulum Catchment Area :-
Note by Mr. HOLLINGSWORTH, A.M.I.C.E., The liability to contamination of,.........
The Storage of the Water,
The Source of the Samples of Water examined,
The Preparation of the Media used,
The method of taking and examining the samples,
PAGE.
107
108
109
109
111
111
113
The Coli Group :-
The tests used by various Authorities for the Group,
114
The tests used in this investigation,
119
•
The value of the Coli Group as an indicator of pollution,....................
120
121
The presence of Pathogenic organisms in water,
The results of the examination of the water :-
(A.) The Unfiltered Pokfulum Water :-
1. The total unfiltered water,
2. Intake The Plunkett's Gap Stream,
3.
-The Mount Austin Stream,
}}
4.
--The No. 1 Syphon,
5.
-The Pinewood Nullah,
11
130 samples,.
122
16
130
16
132
12
57
134
""
30
138
140
6. General summary of results of unfiltered water,
(B.) The Filtered Pokfulum Water :-
1. The No. 6 Bed, 45 samples,
2. The No. 2 Bed, 18
11
1
3. The No. 5 Bed, 34
*
4. The No. 1 Bed, 32
17
1
5. General summary of results of the filtered water,
(C.) Other Hongkong Water Supplies, 42 samples,
The results obtained from water in England and America, and in the Tropics
generally,
Summary of the Bacteriological results obtained in this investigation,
1. The Lactose Fermenting Bacilli in Human Excreta,
2. The Lactose Fermenting Bacilli isolated from the water,
Conclusions,
List of Original Papers consulted,
141
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169