. General physiology; an outline of the science of life. ELEMENTARY VITAL PHENOMENA 201 viduals apply themselves parallel to one another at their mouth- openings (Fig. 82,1., o), their masses of protoplasm join together to form a bridge, and very characteristic changes in the nuclei begin. As above remarked, ciliate Infusoria have two forms of nucleus— -a macronucleus, or chief nucleus, and one or more micronuclei, or. Fig. S2.—Conjugation of ParamachLm in the various successive stages; K^ macronucleus; n k, micronucleus. I. Beginning of conjugation. II. The micronucleus has divided twice in s
. General physiology; an outline of the science of life. ELEMENTARY VITAL PHENOMENA 201 viduals apply themselves parallel to one another at their mouth- openings (Fig. 82,1., o), their masses of protoplasm join together to form a bridge, and very characteristic changes in the nuclei begin. As above remarked, ciliate Infusoria have two forms of nucleus— -a macronucleus, or chief nucleus, and one or more micronuclei, or. Fig. S2.—Conjugation of ParamachLm in the various successive stages; K^ macronucleus; n k, micronucleus. I. Beginning of conjugation. II. The micronucleus has divided twice in succession. III. Three of the four portions of the micronucleiis perish, the fourth divides once more into a male m and a female w nucleus. IV. WhUe the macronucleus is disin- tegrating, the two male nuclei, \m and 5m, become exchanged and unite with the two female nuclei into a nucleus, V. i, which divides in turn into t' and t". VI t' and t" divide. VII. Fi'om this division arise the rudiments of the new macronucleus pt and the new micro- nucleus nk'. The old macronucleus perishes. (After R. Hertwig.) accessory nuclei. During conjugation the macronucleus perishes, disintegrating and dissolving in the protoplasm. If the Paramce- cium be a form possessing one micronucleus, such as Paraincecium caudatum, where the relations are simplest, the micronucleus in each individual divides twice in succession, so that four partial nuclei arise. Three of these likewise dissolve in the protoplasm,. 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 Verworn, Max, 1863-1921; Lee, Frederic S. (Frederic Schiller), 1859-1939. London, Macmillan and co. , limited; New York, The Macmillan company
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