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air and one covered swimming bath supplied with filtration disinfection and aeration
plant (Turnover Company, Belfast). The examination consisted of counts per
cubic centimetre of the bacterial colonies obtained after 48 hours' plate culture on
agar at 37 deg. C. from -1 to "5 cubic centimetres of the water, and included tests*
for the presence of Bacillus Coli Communis in samples of 1 c.c. to 10 c.c.'s.
I.—Fill and draw supply baths—without any process of filtration or purification
by chemical means.
1. Open-air at Eltham, Mill wall, Victoria Gardens, Woolwich, Southwark Park, and Tooting.
Average and Total. Average of Counts. B. Coli. present.
Five baths. 42 samples ex- 950 colonies per c.c. In 1 c.c., 19 samples,
amined between 31st Highest count, 20,000 per c.c., In 5 c.c., 10 samples.
May and 21st October). lowest, 1 per c.c. In 10 c.c., 3 samples.
No B. Coli., 10 samples.
2. Covered school bath at Gray-street, Blackfriars.
Number of Colonies
per c.c. Presence of B. Coli.
(i.) Tap supply before inflow, 1, May 11th 4 In 5 c.c.
(ii.) Main supply at bath inflow, 1, May 11th 31 In 5 c.c.
(iii.) Fresh filled bath before use, 3 examinations 95 Average. In 1 c.c. in one.
May 9th and 30th, July 4th. In 10 c.c., in one.
Absent in one.
(iv.) Bath water during use, 3 examinations.
May 11th
June 1st 65,650 Average. In 1 c.c., in three.
July 6th
II.—(ii.) Natural and artificial bathing ponds at Clapham Common, Highgate,
Hampstead, Victoria Park, Plumstead, Brockwell and Ken Wood.
Average of counts. B. Coli present.
Seven ponds. 13 examinations between 1,250 bacteria, per c.c. In 1 ex., in 11 samples.
May 2nd and October 4th. Highest, 14,000 per c.c. In 5 c.c., in 1 sample.
Lowest, 6 per c.c. In 10, c.c. in 1 sample.
III.—Swimming baths supplied with means of water purification by filtration,
chlorination and aeration—installed with Turnover Company's plant (Belfast)—
1. Open-air.
Bath. No. of examinations. Average No. of Highest. Lowest. B. Coli. present.
Colonies per c.c.
Peckham 17 (May to October) 50 500 0 No B. Coli in 12
(Below 10 colonies in specimens.
10 out of 17 In 10 c.c. in 2.
specimens.) In 1 c.c. in one
specimen of
October 18th,
when plant not
working.
Highbury 9 (June to October) 10 13 4 No B. Coli in 4,
present in 5 c.c.
in one when
plant not work-
2. Covered. ing.
Gt. Smith 14 (April to August) 350 3,500 0 No B. Coli in 13'
street (10 colonies and under present in 5 c.c*
10 in 9 specimens).
Total.
Three baths, 150 No B. Coli in 29.
36 specimens. B. Coli in 5 c.c. in 2.
B. Coli in 10 c.c. in 3.
* The standard adopted by the Bathing Committee of the American Public Health Association
(1923 and 1925) requires that:—
(1) Not more than 1,000 organisms in 24 hours' growth at 37 deg. C. shall be found in more
than 10 per cent, of samples.
(2) Not more than two out of five samples of 10 c.c. on the same day shall show the presence
of B. Coli.