London's Pulse: Medical Officer of Health reports 1848-1972

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Walthamstow 1948

[Report of the Medical Officer of Health for Walthamstow]

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Plate CountOld Standard TestNot Pass ableNew (Provisional) Test Methylene Blue Test
Coliform Reaction (in 1/10 ml.)Bacterium coli (in 1/10 ml.)Very satisfactoryPassable
Reduction timeGrade
15,000--XIn 3½ hours2
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
40,000X„ 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 tubeX„ 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 tubesX„ 1½ „3
26,000*3 tubes-X,, 1½„3
18,000-X„1½„3
13,000*2 tubesX,, 1½ „3
20,000*3 tubesX„ 1 „3
18,000*2 tubesX„ 1 „3
45,000*3 tubes-X,, ½ „3
250,000X„ 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 tubesX„ 0 „4
180,000*3 tubes*3 tubesX„ 2½ „2
400,000*3 tubes* 3 tubesX,, 0 „4
15,000*3 tubes*3 tubesX„ 0 „4
4,000*3 tubes*2 tubesX„ 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.