. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Experiment with mold on bread; ^, in a living room; B, in an ice-box; C, above the stove in a kitchen. pose both jars to the air of the living room or kitchen for five minutes. Then cover both jars and plunge one into boiling water for a few minutes. Now place the jars side by side in a moderately warm room for two or three days. In which jar does growth appear first? Do both jars have like growth of mold in the given period of time ? Other experiments may be performed to show the rela- tio
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Experiment with mold on bread; ^, in a living room; B, in an ice-box; C, above the stove in a kitchen. pose both jars to the air of the living room or kitchen for five minutes. Then cover both jars and plunge one into boiling water for a few minutes. Now place the jars side by side in a moderately warm room for two or three days. In which jar does growth appear first? Do both jars have like growth of mold in the given period of time ? Other experiments may be performed to show the rela- tion of the growth of mold to light, to different degrees of moisture and to different tem- peratures. Why do things get moldy in a damp locality quicker than in a dry one ? How Avould you account for the growth of mold inside of a jar of preserves or jelly? Can you determine by experi- ment whether black mold uses oxygen in its growth? Directions for Growth of Mold. â Bread mold may be conveniently grown for laboratory use in small shallow dishes (Syracuse watch glasses, Petri dishes, or butter chips). If bread is exposed to the air for a few minutes and then left in the covered dishes for a day or two, with a bit of wet sponge or blotting paper in the dish to keep the air moist, a good supply of mold may be obtained in a convenient dish for observational purposes.^ Observations on Mold. â Examine the tangled mass of threads which cover the bread. This is called the mycelium, each thread being called a hypha. How do the hyphae appear to be attached to the bread? Many of the hyphse are prolonged into tiny upright threads, bearing at the top a little ball. With the low power of the microscope the structure of a sporangium may be made out. The dark-colored ones are full of ripe spores, which may be seen by lightly tapping the cover slip over the slide. How do the spores normally get out of the sporangium? Try to find some young sporangia and note the differ- ences in size and colo
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