Taking the mean proportion of organic impurity in the Thames water delivered in London in 1868 as 1,000, in the subsequent years the following proportions were present respectively in the Thames water, in the Lea water, and in the Deep Well water.
|Year.||Proportion of organic impurity present in Thames water as delivered in London.||Proportion of organic impurity present in Lea water as delivered in London.||Proportion of organic impurity present in Deep Well water as delivered in London.|
match: ALTO ComposedBlock
* For purposes of comparison the average yearly amount of organic elements
(organic carbon and organic nitrogen) found during the nine years ending 1876
in the water supplied by the Kent Company is taken as the unit.