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To sum up, it may be observed, that these extended enquiries, though leaving many points yet imperfect, still go to confirm the general conclusions arrived at in my first communication, favorable to the water of the Hooghly, compared either with the Calcutta Tank waters or the present London waters. I may repeat what I then said; "Such are the conclusions I have arrived at, some of them unexpected even to myself, and which may be disputed by others." And I may add, that they can only be properly controverted by evidence of the incorrectness of the experimental results from which these conclusions have been drawn.

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