Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Walthamstow]
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Plate Count | Old Standard Test | Not Pass able | New (Provisional) Test Methylene Blue Test | ||||
---|---|---|---|---|---|---|---|
Coliform Reaction (in 1/10 ml.) | Bacterium coli (in 1/10 ml.) | Very satisfactory | Passable | ||||
Reduction time | Grade | ||||||
15,000 | - | - | X | In 3½ hours | 2 | ||
3,000 | - | - | X | „3½ „ | 2 | ||
2,000 | - | - | „ 3½ „ | 2 | |||
1,000 | - | - | X | „ 3 „ | 2 | ||
6,000 | - | - | X | „ 3 „ | 2 | ||
40,000 | *3 tubes | - | X | ,, 3 ,, | 2 | ||
8,600 | *2 tubes | - | X | „ 3 „ | 2 | ||
120,000 | — | - | X | „ 3 „ | 2 | ||
60,000 | *3 tubes | - | X | „ 3 „ | 2 | ||
20,000 | *3 tubes | - | X | „ 2½ „ | 2 | ||
40,000 | — | — | X | „ 2½ „ | 2 | ||
9,800 | — | - | X | „ 2½ „ | 2 | ||
8,000 | *3 tubes | - | X | „ 2½ „ | 2 | ||
20,000 | * 3 tubes | - | X | „ 2½ „ | 2 | ||
7,600 | *1 tube | - | X | „ 2½ „ | 2 | ||
5,800 | *2 tubes | - | X | „ 2½ „ | 2 | ||
50,000 | * 3 tubes | - | X | „ 2½ „ | 2 | ||
15,000 | *3 tubes | - | X | „ 2½ „ | 2 | ||
8,000 | *1 tube | — | X | „ 2½ „ | 2 | ||
15,000 | *3 tubes | - | X | „ 2 „ | 3 | ||
100,000 | *3 tubes | - | X | „ 2 „ | 3 | ||
5,000 | *2 tubes | - | X | „ 2 „ | 3 | ||
7,500 | *3 tubes | - | X | „ 14 „ | 3 | ||
6,000 | * 3 tubes | — | X | „ 1½ „ | 3 | ||
26,000 | *3 tubes | - | X | ,, 1½„ | 3 | ||
18,000 | — | - | X | „1½„ | 3 | ||
13,000 | *2 tubes | — | X | ,, 1½ „ | 3 | ||
20,000 | *3 tubes | — | X | „ 1 „ | 3 | ||
18,000 | *2 tubes | — | X | „ 1 „ | 3 | ||
45,000 | *3 tubes | - | X | ,, ½ „ | 3 | ||
250,000 | — | — | X | „ ½ ,, | 3 | ||
59,000 | *3 tubes | - | X | „ 0 „ | 4 | ||
240,000 | *3 tubes | - | X | ,, 0 „ | 4 | ||
2,500,000 | *3 tubes | - | X | ,, 0 „ | 4 | ||
48,000 | *2 tubes | — | X | „ 0 „ | 4 | ||
180,000 | *3 tubes | *3 tubes | X | „ 2½ „ | 2 | ||
400,000 | *3 tubes | * 3 tubes | X | ,, 0 „ | 4 | ||
15,000 | *3 tubes | *3 tubes | X | „ 0 „ | 4 | ||
4,000 | *3 tubes | *2 tubes | X | „ 0 „ | 4 |
By the old test, of a total of 61, 54 are in a category not less
than 'passable," whereas by the new (Provisional) test only 41
were classified in Grades 1 and 2.