A Field And Laboratory Guide in Biological Nature Study
A Field And Laboratory Guide in Biological Nature Study
Elliot Rowland Downing
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What kind is it? What is your conclusion? What is essential that any process of sterilization be effective ? Useful fungi. The molds and other fungi are among man's most useful allies, although. Some of them are also injurious. The soil, especially rich soil like that of the forest, is full of them, and they decompose the organic matter and reduce it to substances that plants can use for food once more. The very numerous hyphal threads come in contact with the roots and help them to get in touc...h with adequate supplies of moisture and nutrition. Examine rich garden soil or humus from the woods to see if you can detect these molds. Yeast. One sort of yeast is used constantly in bread-making and other kinds are used in the manufacture of beer, cheese, etc. The compressed yeast cake is just a mass of these yeast plants with more or less starch and other foreign matter. What is its color ? The dried yeast cake is the same, dried out. Put a quarter of a yeast cake into a half-cup of molasses or sugar syrup in a flask or bottle and let it stand in a warm place until it ferments.
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