. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . ue thedemonstration. XV. ALCOHOLIC DRINKS AND THEIREFFECT ON THE HUiMAN RACE How Alcohol is Made.—There are many different Ivindsof alcoliol, each of whicii is produced in a different alcohol is made by roasting wood and catching thevapors that pass off. The alcohol used in drinks is al-ways produced by the growtli of yeast in a liquid con-taining sugar. The yea^t isan oval or spherical one-celled plant too small to beseen except under a micro-scope magnif
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . ue thedemonstration. XV. ALCOHOLIC DRINKS AND THEIREFFECT ON THE HUiMAN RACE How Alcohol is Made.—There are many different Ivindsof alcoliol, each of whicii is produced in a different alcohol is made by roasting wood and catching thevapors that pass off. The alcohol used in drinks is al-ways produced by the growtli of yeast in a liquid con-taining sugar. The yea^t isan oval or spherical one-celled plant too small to beseen except under a micro-scope magnifying a hundreddiameters. A yeast cake, such asis purchased at the store,contains millions of yeastplants. They multiply bybudding. That is, a littleprojection pushes out onone side and continues togrow a half hour until it is the size of the mother a yeast cake is put in a glass of water in whiclia Leaping teaspoonful of sugar has been dissolved, theyeast will grow rapidly when kept in a warm place. Thechemical action produced by the growth is an hour or two the appearance of bubbles shows that 163. Fig. 108.—Yeast plants, many ofwhich bear buds. Photographedthrough the microscope. 164 ALCOHOLIC DKIXKS CMMiWCiten
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