. Elementary biology, animal and human. Biology. MICROOBGANISMS AND HUMAN WELFARE 11. _ spherical bacteria (cocci) tod-shaped bacteria (bacilli) colorless organisms; these are the bacteria. A careful study of many kinds of bacteria shows that they have several char- acteristic shapes (see Fig. 7), by means of which they may be roughly classified. Some are rod-shaped (like a firecracker), some are spheri- cal, or egg-shaped, and still others are spiral-shaped. Each bacterium is a tiny bit of trans- lucent protoplasm, inclosed in a cell wall of cellulose. Thus far no nu- cleus has been dis- cove
. Elementary biology, animal and human. Biology. MICROOBGANISMS AND HUMAN WELFARE 11. _ spherical bacteria (cocci) tod-shaped bacteria (bacilli) colorless organisms; these are the bacteria. A careful study of many kinds of bacteria shows that they have several char- acteristic shapes (see Fig. 7), by means of which they may be roughly classified. Some are rod-shaped (like a firecracker), some are spheri- cal, or egg-shaped, and still others are spiral-shaped. Each bacterium is a tiny bit of trans- lucent protoplasm, inclosed in a cell wall of cellulose. Thus far no nu- cleus has been dis- covered in any kind of bacteria. Because of their cellulose walls, and because of their likeness to certain of green plants, bi- ologists now regard these organisms as plants rather than animals. Some kinds of bacteria have one or more long, hairlike projections from the ends, called dl'i-a, which give the germs still further resemblance to firecrackers. These cilia lash about rapidly, and thus drive the cell through the water. The spiral bacteria roll over and over, and advance in a spiral path like a corkscrew. spiral bacteria (spirilla) §^S>^ .bacteria with spores 7. — Various forms of 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 Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1912
