. Introduction to botany. Botany. Slime Moulds, Bacteria, and Yeasts. 261 which are injurious instead of beneficial, such as those pro- ducing consumption, diphtheria, typhoid fever, lockjaw, blood poisoning, bubonic plague, etc. (Figs. 133-134). These diseases are brought about by poisons produced by the bac- teria within the body. Great advances in surgery and in the treatment and prevention of dis- eases have been made by an un- derstanding of the life history and habits of these microscopic forms of life. It is now known, for instance, that gangrene and blood poisoning, which formerly ofte
. Introduction to botany. Botany. Slime Moulds, Bacteria, and Yeasts. 261 which are injurious instead of beneficial, such as those pro- ducing consumption, diphtheria, typhoid fever, lockjaw, blood poisoning, bubonic plague, etc. (Figs. 133-134). These diseases are brought about by poisons produced by the bac- teria within the body. Great advances in surgery and in the treatment and prevention of dis- eases have been made by an un- derstanding of the life history and habits of these microscopic forms of life. It is now known, for instance, that gangrene and blood poisoning, which formerly often followed in the wake of surgical operations, were brought about by bacteria clinging to the surgeon's knife, or which were in the water, bandages, etc., used in dressing the wound. Now every instrument or object em- ployed in such operations is thor- oughly sterilized, and the healing of the wound goes forward with- out complications. So, too, it is now known that the expectorations of consumptives and the dejecta of typhoid patients are teeming with the bac- teria causing these diseases, and that unless the bacteria are destroyed by suitable poisons or heat they may spread disease. 158. The Nature of Yeasts. — Yeasts are low forms of plants which, like bacteria, are destitute of chlorophyll, and are dependent for their food upon materials built up. Fig. 13s. showing the impor- tance of nitrogen-fixing bacteria to leguminous plants, t, peas grown in a nitrogen-free soil with bacteria; u, the same in all re- spects, but without bacteria. Af- ter 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 Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
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