. La biologie élémentaire, animale et humaine. La biologie. Et BIEN-ÊTRE MICBOOBGANISMS HITMAN 81 la tuberculose, qui est plus communément connu sous le nom de la consommation. Dans la seule ville de New York le Conseil de la Santé rapporte de 300 à 400 nouveaux cas par semaine. Pourtant, si le grand public ne connaissait que la manière dont cette maladie est transmise et permettrait l'utilisation de ces connaissances, l'horrible sacrifice de la vie et de la santé en raison de cette " grande peste blanche " pourrait être presque totalement empêchée. Il a été prouvé de manière concluante en 1882 par le Dr Koch, un chercheur allemand (Fig. 13),que la tuberculose est toujours causée par extre

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. Elementary biology, animal and human. Biology. MICBOOBGANISMS AND HITMAN WELFARE 81 tuberculosis, which is more commonly known as consump- tion. In New York City alone the Board of Health reports 300 to 400 new cases every week. Yet if the general public only knew the manner in which this disease is transmitted and would make use of this knowledge, the dreadful sacrifice of life and health due to this " great white plague " could be almost wholly prevented. It was conclusively proved in 1882 by Dr. Koch, a noted German scientist (Fig. 13), that tuberculosis is always caused by extremely sm^U, rod-shaped bacteria, bacillus tuberculosis (Fig. 14). He found countless numbers of these living germs in the sputum coughed up by consumptive patients; he cultivated these germs in test tubes and when he injected the bacteria into the bodies of guinea pigs or rabbits, the animals be- came ill with tuberculosis. By many experiments of this sort, biologists have learned important facts in regard to the cause, preven- tion, and cure of disease. p, ^. 14 -Tubei^i^j^STbTcteria in human We are absolutely sure sputum. (Courtesy of Dr. Thomas S. then, that before any one amngton.) can become a consumptive, he must take into his body the living bacteria of consumption, and the most common avenue of infection is through the nose and air passages. Consump- tives who are ignorant of the danger they are causing, fre- quently expectorate on the floors of rooms or of pubUc con- veyances, and when this sputum becomes dried, the germs are likely to be blown about in the air, and to be inhaled by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company

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