. Elementary principles of agriculture : a text book for the common schools. Agriculture. 6 Elementary Principles of Agriculture 9a. Food Materials for Yeast. Secure two large bottles or fruit jars, and fill both about two-thirds full of clear well-water. To one jar add a teaspoonful of sugar and about as much of the white of an egg. See that both are completely dissolved. Now add to both jars small lumps of the ordinary "compressed yeast, " or dry yeast cake, secured from the bakery. Whichever is used, see that it is well dissolved in a' spoonful of water before adding to the jar. S
. Elementary principles of agriculture : a text book for the common schools. Agriculture. 6 Elementary Principles of Agriculture 9a. Food Materials for Yeast. Secure two large bottles or fruit jars, and fill both about two-thirds full of clear well-water. To one jar add a teaspoonful of sugar and about as much of the white of an egg. See that both are completely dissolved. Now add to both jars small lumps of the ordinary "compressed yeast, " or dry yeast cake, secured from the bakery. Whichever is used, see that it is well dissolved in a' spoonful of water before adding to the jar. Stir well and notice that the liquids are clear, or nearly so. Set aside in a warm place, but not in strong light, and observe once or twice a day for several days. The liquid soon becomes cloudy in the jar to which the food was added, but not in the jar of water. The cloudy effects are due to the large number of yeast plants formed. The sugar and egg substance furnish the nourishment for their growth. They do not nmltiply in the pure water. Yeast grows in the bread dough because the dough contains all the substances needed for the nourishment of the yeast plants. In the "dry yeast" these tiny cells are in a dormant condition, like seeds. 10. The Green "Pond Scums" belong to a class of plants called algae (singular, alga). There are many kinds, and nearly all of them are very simple, being composed of single cells, or small masses of cells. Algce contain a green coloring matter, which yeast-like plants do not have. We shall later learn something of the value of this green coloring matter to the plant. 11. The Food Materials of Green Plants are made from water, carbonic acid gas, and the simple minerals dissolved in the natural waters of the soil. These are combined to make all the substances necessary for the nourishment and growth of their cells. They must. Fig. 4. Cells of Algae A, a simple one-celled form with the cells embedded in a jelly- like wall. B an
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