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Updated: June 11, 2025
Then there were effluents of the main river to be waded through, and every now and then they were forced back by impenetrable thickets to the hillside, where they scrambled along a talus of frost-shattered rock. They entered transverse valleys, and after hours of exhausting labor abandoned the search of each in turn and plodded back to the one they had been following.
He reports as follows: "The reduction of organic matter in solution is the crucial test of the value of a purifying agent, for unless the organic matter is reduced, the effluent will putrefy and rapidly become offensive. "I have not observed in any of the unfiltered effluents from this process which I have examined any signs of putrefaction, but, on the contrary, a tendency to oxidize.
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