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 | New (Provisional) Test Methylene Blue Test | |||||
---|---|---|---|---|---|---|---|
Coliform Reaction in 1/10 ml.) | Bacterium coli (in 1/10 ml.) | Very satis-factory | Pass-able | Not Pass' able | |||
Reduction time | Grade | ||||||
5,600 | — | — | X | „ 4½ „ | 1 | ||
900 | — | — | X | „ 4½ „ | 1 | ||
400 | — | — | X | „ 4½ „ | 1 | ||
300 | — | — | X | „ 4½ „ | 1 | ||
300 | — | — | X | „ 4½ „ | 1 | ||
600 | — | — | X | „ 4½ „ | 1 | ||
500 | — | — | X | „ 4½ „ | 1 | ||
100 | — | — | X | „ 4½ „ | 1 | ||
3,000 | — | — | X | „ 4½ „ | 1 | ||
1,500 | — | — | X | „ 4½ „ | 1 | ||
3,000 | xl tube | — | X | „ 4½ „ | 1 | ||
2,400 | — | — | X | „ 4½ „ | 1 | ||
3,500 | — | — | X | In 4 „ | 2 | ||
9,200 | — | — | X | „ 4 „ | 2 | ||
18,000 | — | — | X | „ 4 „ | 2 | ||
26,000 | — | — | X | „ 4 „ | 2 | ||
80,000 | — | — | X | „ 4 „ | 2 | ||
12,000 | — | — | X | „ 4 „ | 2 | ||
7,000 | x3 tubes | — | X | „ 4 „ | 2 | ||
1,500 | xl tube | — | X | „ 4 „ | 2 | ||
4,000 | x2 tubes | — | X | „ 4 „ | 2 | ||
6,500 | x3 tubes | — | X | „ 4 „ | 2 | ||
9,800 | x3 tubes | — | X | „ 4 „ | 2 | ||
32,000 | x3 tubes | — | X | „ 4 „ | 2 | ||
20,000 | x3 tubes | — | X | „ 4 „ | 2 | ||
130,000 | — | — | X | „ 3½ „ | 2 | ||
9,000 | x3 tubes | — | X | „ 3½ „ | 2 | ||
15,000 | — | — | X | „ 3½ „ | 2 | ||
14,000 | — | — | X | „ 3½ „ | 2 | ||
36,000 | x3 tubes | — | X | „ 3½ „ | 2 | ||
23,000 | x3 tubes | — | X | „ 3½ „ | 2 | ||
50,000 | x3 tubes | — | X | „ 3 „ | 2 | ||
2,000 | x3 tubes | — | X | „ 3 „ | 2 | ||
90,000 | x3 tubes | — | X | „ 3 „ | 2 | ||
1,700 | xl tube | — | X | „ 3 „ | 2 | ||
8,000 | x3 tubes | — | X | „ 3 „ | 2 | ||
38,000 | x3 tubes | — | X | „ 3 „ | 2 | ||
4,500 | — | — | X | „ 2½ „ | 2 | ||
180,000 | — | — | X | „ 2½ „ | 2 | ||
12,000 | — | — | X | „ 2½ „ | 2 | ||
90,000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
36,000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
22.000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
26,000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
80,000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
7,000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
30,000 | — | — | X | „ 2½ „ | 2 | ||
5,000 | — | — | X | ' | „ 2½ „ | 2 | |
25,000 | x3 tubes | — | X | „ 2½ „ | 2 | ||
12,000 | xl tube | — | X | „ 2½ „ | 2 | ||
140,000 | x3 tubes | — | X | „ 2 „ | 3 | ||
40,000 | x3 tubes | — | X | „ 1½ „ | 3 | ||
35,000 | x2 tubes | — | X | „ 1½ „ | 3 | ||
120,000 | x3 tubes | — | X | „ 1 „ | 3 | ||
250,000 | x3 tubes | — | X | „ 1 „ | 3 | ||
90,000 | x3 tubes | — | X | „ 1 „ | 3 | ||
80,000 | x3 tubes | — | X | „½„ | 3 |