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Baltimore, Jan. 16, 1903.
To the Editor:
—By accident, a few years ago, I discovered this simple but accurate method of reducing the strength of solutions, and finding it so useful in my special line, viz., throat and nose work, I hope you will publish it and that it may prove of value to some fellow practitioner. It is as follows:Of the original solution take a number of parts equal to the percentage to which it is desired to reduce and thereto add a sufficient number of parts of the diluting substance (as of water) so that the sum of the two will be equal to the percentage of the original solution.As, for example, to reduce a 10 per cent, solution to a 4 per cent. solution: Take 4 parts of the 10 per cent, solution and add thereto 6 parts of water, and so obtain the desired
Hardcastle H. Method of Reducing Strength of Solutions.. JAMA. 1903;XL(4):257. doi:10.1001/jama.1903.02490040053015