Read it through once

A word further concerning the nasty but all-purifying Ganges water. When we went to Agra, by and by, we happened there just in time to be in at the birth of a marvel—a memorable scientific discovery—the discovery that in certain ways the foul and derided Ganges water is the most puissant purifier in the world! This curious fact, as I have said, had just been added to the treasury of modern science. It had long been noted as a strange thing that while Benares is often afflicted with the cholera she does not spread it beyond her borders. This could not be accounted for. Mr. Henkin, the scientist in the employ of the government of Agra, concluded to examine the water. He went to Benares and made his tests. He got water at the mouths of the sewers where they empty into the river at the bathing ghats; a cubic centimetre of it contained millions of germs; at the end of six hours they were all dead. He caught a floating corpse, towed it to the shore, and from beside it he dipped up water that was swarming with cholera germs; at the end of six hours they were all dead. He added swarm after swarm of cholera germs to this water; within the six hours they always died, to the last sample. Repeatedly, he took pure well water which was barren of animal life, and put into it a few cholera germs; they always began to propagate at once, and always within six hours they swarmed—and were numberable by millions upon millions.