. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SHAPE OF MICROORGANISMS 27 Even in the face of these assumptions one need not fear, for bacteria have been on this earth, and have been multiplying, prob- ably long before the advent of man, and as yet the earth has not been filled by them. This is due to there being a struggle among them just as there is among higher plants and animals. One knows that if wheat be sown too thickly, none of it will mature. Sometimes it is due to a lack of food, other times to a lack of f ' f C ^^ J O J r \ v*%, {. Fig. 10.—
. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SHAPE OF MICROORGANISMS 27 Even in the face of these assumptions one need not fear, for bacteria have been on this earth, and have been multiplying, prob- ably long before the advent of man, and as yet the earth has not been filled by them. This is due to there being a struggle among them just as there is among higher plants and animals. One knows that if wheat be sown too thickly, none of it will mature. Sometimes it is due to a lack of food, other times to a lack of f ' f C ^^ J O J r \ v*%, {. Fig. 10.—Small Spirilla (after Ome- lianskl).. Fig. II.—Involution forms of bacilli (after Harrison). sunshine, and at still other times it is due to a lack of moisture which prevents its growth. So it is with bacteria—the food or water may give out. However, more often it is the bacterial products which have accumulated to such an extent that their multiplication is prevented. Size and Weight.—The unit of measurement in microscopic work is the micron. It is one-thousandth of a millimeter in length, or approximately one-twenty-five-thousandth of an inch. It is represented by the symbol [^. Most bacteria are from to 5 microns in length. Some are so small that they cannot be seen with the microscope. Others may be even thirty or forty microns in length. They are smallest in the case of the cocci and largest in the case of the spirilla. Although there is a great variation in the size of bacteria, all. 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 Greaves, Joseph Eames, 1880-; Greaves, Ethelyn O. , joint author. New York, D. Van Nostrand Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteriologyagricult
