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On the Statistical Interpretation of some Bacteriological Methods employed in Water Analysis

Published online by Cambridge University Press:  15 May 2009

M. Greenwood Junr  and
G. Udny Yule
M. Greenwood Junr
Affiliation:
(Lister Institute of Preventive Medicine.)
G. Udny Yule
Affiliation:
(Lister Institute of Preventive Medicine.)
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We were recently consulted by an officer serving on the Western Front as to the significance attaching to ordinary bacteriological methods of gauging the potability of waters. He wished to know what was the probability that a given water supply did not contain more than a certain proportion of bacteria in the unit volume, it having been found that particular samples tested showed no growth while, perhaps, larger samples had done so, or that so many out of a series of samples of the same size had given positive results. Having obtained what seemed to us a reasonable solution of the particular problem proposed, we thought that the results might interest other officers and bacteriologists who have to do similar work. A survey of the criteria actually used by bacteriologists when they form an opinion as to the purity of waters seems to us to emphasise the need for some discussion.

Type
Research Article
Information
Journal of Hygiene , Volume 16 , Issue 1 , July 1917 , pp. 36 - 54
Copyright
Copyright © Cambridge University Press 1917

References

page 37 note 1 Savage, , The Bacterialogical Examination of Water Supplies, pp. 185–6. London, 1906Google Scholar.

page 37 note 2 Bacteriological Examination of Water in the Field. Journ. Royal Army Medical Corps. 09 1914Google Scholar.

page 37 note 3 Manual of Bacteriology, 5th Edition. London, 1914Google Scholar.

page 40 note 1 Beveridge, and Wanhill, , The Sanitary Officer's Handbook of Practical Hygiene, 2nd Edition. London, 1912.Google Scholar

page 41 note 1 Recherches sur la Probabilité d. Jugements, etc., p. 190 and p. 206Google Scholar.