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It gives the impression that the bacillus growth not only liquefies the gelatine, but causes a rapid evaporation of the fluid so formed. Many bacteria also have the power of so liquefying gelatine with which they are inoculated, but never do they produce such an excavation with the bladder-like cavity on the surface.
The man who was immune to yellow fever was carried away by cholera; and if he were immune to that, too, the Black Death, which was the bubonic plague, swept him away. For it was these bacteria, and germs, and microbes, and bacilli, cultured in the laboratories of the West, that had come down upon China in the rain of glass. All organization vanished. The government crumbled away.
In still another way the sun is one of our best friends; for his rays have the wonderful power, not only of causing plants that supply us with food the Green Plants, as we call them to grow and flourish, but at the same time of withering and killing certain plants that do us harm. These plants the Colorless Plants, we may call them are the molds, the fungi, and the bacteria, or germs.
By the next milking they become very abundant in the ducts, and the first milk drawn washes most of them at once into the milk pail, where they can continue their growth in the milk. Again, the exterior of the cow's body contains them in abundance. Every hair, every particle of dirt, every bit of dried manure, is a lurking place for millions of bacteria.
Comparatively small doses over a long time produce changes in organs that lead to serious results. "It is," went on Kennedy, as the full horror of the thing sank into our minds, "the indol-and phenol-producing bacteria which are the undesirable citizens of the body, while the lactic-acid producing germs check the production of indol and phenol.
Butyric acid is a common ingredient in old milk and in butter, and its formation by bacteria was historically one of the first bacterial fermentations to be clearly understood. It can be produced also in various sugar and starchy solutions. Glycerine may also undergo a butyric fermentation.
That different flavours are due to the ripening produced by different kinds of bacteria would appear to be almost certain when we remember, as we have already noticed, the different kinds of decomposition produced by different species of bacteria.
A writer must make up his mind to the possible rough treatment of the critics, who swarm like bacteria whenever there is any literary material on which they can feed.
Every year more than one hundred and twenty-five thousand people of the United States die because they are unable to withstand its persistent attacks; five million Americans now living are doomed to death at the hands of these executioners, and the figures must be more than doubled to cover the casualties on the human side in the battles with the regiments of all the species of bacteria causing disease.
There is no variation during geologic time of these primordial living organisms. All conceivable changes of environment have passed over them, but they change not. Bacteria struggle together, one form devouring another form. Unicellular life long precedes multicellular.
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