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in a paper before the Physiological Society of Berlin, he announced the discovery of the _tubercle bacillus_. He was able to demonstrate the existence of the germ of consumption, and to describe its methods of life, as well as the character of his ravages. Here then at last was laid bare the true origin of the most fatal disease which has ever afflicted mankind. He who has not informed himself with respect to the almost universal prevalence of consumption among the nations of the earth, or taken note of the mortality from that dreaded enemy, by which nearly one-sixth of the human race sooner or later perishes, will not have realized the awful character of this enemy. To attack such a foe, to force him into a corner, even as Siegfried did the Grendel in his cavern, was an achievement of which the greatest of mankind might well be proud. The discovery of the bacillus of consumption by no means assured the cure of the disease; but it foretokened the time when a cure would be found. This prophecy, though it has not yet been clearly fulfilled, is, in the closing years of the century, in process of fulfillment. The enemy does not readily yield; but such has been the gain in the contest that already within the last twenty years the mortality from consumption of the lungs has fallen off more than forty per cent! Much of this gain has been made by the reviving confidence of human beings that sooner or later tuberculosis would be destroyed. Hygiene has done its part; and other circumstances have conduced to the same result. Though neither Dr. Koch nor any other man living has been able as yet positively to meet and vanquish consumption in open battle, yet the goblin has in a measure been robbed of his terrors. He is no longer boastful and victorious over the human race. After the discovery of the tubercle bacillus, the fame of Robert Koch became world-wide. In the following year he was made a privy councilor, and was placed in charge of an expedition organized by the German government to go into Egypt and India for the investigation of the causes of Asiatic cholera. The expedition was engaged in this work for nearly a year. Koch pursued his usual careful method of scientific experimentation. He exposed himself to the contagion of cholera, but his science and fine constitution stood him well in hand, and he returned unharmed. It was in May of 1884 that he was able to announce the discovery of the _coma bacillus_, that is
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