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

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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Islington 1900

Forty-fifth annual report on the health and sanitary condition of the Borough of Islington

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WATER ANALYSIS.
In the following tables I state the analyses (made monthly) of
the New River Company's Water recorded during the year.

Table: Analyses of Samples taken from the Works of the Company.

Analyses of Samples taken from the Works of the Company.

1900.Total Solid Matter.Chlorine.Equal to Chloride of Sodium.Nitrogen as Nitrates.Nitrogen as Ammonia.Oxygen required to oxidise Organic Matter.Degree of Hardness.Degree after boiling ¼ of an hour.Organic Carbon.Organic Nitrogen.
January26.401.5122.4780.1980.0000.02317.163.80....
February25.501.3682.2420.198„0.02317.584.20....
March24.001.4402.3600.219„0. 04817.164.50....
April22.401.2242.0060.188„0.00716.103.80....
May22.601.2242.0060.156„0.00815.683.89....
June22.401.2962.1240.208„0.00815.683.50....
July21.601.2962.1240.188„0.00816.103.59....
August22.001.3682.2420.135„0.01214.423.19....
September25.201.3682.2420.146„0.01516.103.50....
October22.001.3682.2420.188„0.00815.683.70....
November26.601.3682.2420.198„0.01117.164.20....
December28.801.2962.1240.198„0.01817.163.00....
Average22.041.3442.2030.1850.0000.01616.333.77....

Table: Analyses of Samples taken from the Mains of the Company.

Analyses of Samples taken from the Mains of the Company.

1900.Total Solid Matter.Chlorine.Equal to Chloride of Sodium.Nitrogen as Nitrates.Nitrogen as Ammonia.Oxygen required to oxidise Organic Matter.Degree of Hardness.Degree after boiling ¼ of an hour.Organic Carbon.Organic Nitrogen.
January..1.4222.3300.2290.0000.02417.05..0. 1050.016
February..1.3682.2420.242„0.03216.94..0.1080.015
March..1.2602.0650.260„0.02916.84..0.1180.017
April..1.2242.0060.205„0.01415.89..0.0640.011
May..1.2602.0650.174„0.01016.20..0.0410.007
June..1.2422.0350.206„0.01215.94..0.0390.006
July..12722.0850.184„0.01816.38..0.0340.006
August..1.3142.1530.148„0.01615.36..0.0420.007
September..1.3322.1830.161„0.01115.78..0.0410.008
October..1.3682.2710.185„0.01216.05..0.0350.007
November..1.3922.2810.201„0.01416.81..0.0470.008
December..1.3682.2420.198„0.01717.65..0.0410.008
Average..1.3182.1630.2490.0000.01716.41..0.0600.010