Physiology And Hygiene for Children

Cover Physiology And Hygiene for Children
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When the juice is fii*st pressed out of the apples it contains no alcohol. But unless it is kept cold the sugar in the juice quickly changes into alcohol and a gas, which our fathers called carbonic acid gas, but which to-day is called carbon dioxide. This gas escapes in little bubbles, which may be seen rising up through the liquid, but the alcohol remains in it.
The process by which sugar is changed into alcohol and carbon dioxide is called fermentation. The sugar may be obtained from the jui
...ce of ripe fruits, and from the sap of such plants as the sugar-cane, from the starch of potatoes or of such grains as a\ lieat, corn, rye, and barley.
Fermentation is caused by little plants, called fer- FERMENTATION IN A GLASS OF CIDER.
DRINKS WHICH CONTAIN ALCOHOL 95 ments. They are so small that they cannot be seen without the aid of a microscope. These ferments float about in the air and lodge on the skin and stems of apples, grapes, and other fruit.
When the grapes and apples are crushed and pressed, ferments are washed from them with the juice, or fall into it from the air.


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