. Animal biology; Human biology. Parts II & III of First course in biology. Biology. CHAPTER X. rf»«m ' * '•$* • , «E ..•'&&£„ ^•3 1:^ f^-' - " ' V^^; •>. • ,-• Uro^; Vj *X: •- TVV •:*?/ CD1 BACTERIA AND SANITATION Experiment I. Yeast Plants. — With a microscope examine a drop from a glass of water in which you have washed grapes or apples (Fig. 129). Experiment 2. Fermentation. — Put a tablespoonful of sugar into this water and set the glass in a warm place for a day or two. Do you see any bubbles of gas ? Have the odor and taste changed ? Does the micro- scope show that t
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. CHAPTER X. rf»«m ' * '•$* • , «E ..•'&&£„ ^•3 1:^ f^-' - " ' V^^; •>. • ,-• Uro^; Vj *X: •- TVV •:*?/ CD1 BACTERIA AND SANITATION Experiment I. Yeast Plants. — With a microscope examine a drop from a glass of water in which you have washed grapes or apples (Fig. 129). Experiment 2. Fermentation. — Put a tablespoonful of sugar into this water and set the glass in a warm place for a day or two. Do you see any bubbles of gas ? Have the odor and taste changed ? Does the micro- scope show that the yeast plants are now more abun- dant ? By fermentation, or the growth of yeast in sugar, sugar is changed into carbon dioxid, a gas, and alcohol, a liquid. Experiment 3. A Sani- tary Map. — Construct a sanitary map of the com- munity. Indicate houses where consumption, typhoid fever, or other transmissible diseases have occurred, with number of cases. Mark loca- tion of stagnant waters where mosquitoes breed, mark garbage dumps, unclean streets. Suggest where improvements may be made in drainage, dust, noises, sunshine, shade, etc. Bacteria, or microbes, the smallest living things, are visible only under a microscope of high power. (See "Plant Biology," p. 182.) They obtain food either from dead tissue or from degenerate tissue of living plants, and 158. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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