. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 22 COMPARATIVE PHYSIOLOGY. Multiplication of the species is either hy gemmation or by fission. In the first case the nucleus divides and the frag-. '. Fig. 40. Fio. 36. Fios. 34 to 40.—In the figures d denotes disk; o, peristome; vc, contractile vacuole; vf, food- vacuole; w, vestibule; c[, contractile fiber; c, cyst; wc, nucleus; c^, cilium. Fig. 34.—a group of vorticellse showing the crea- ture in various positions (A, 3). Fia. 35.—The same, in the exte
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 22 COMPARATIVE PHYSIOLOGY. Multiplication of the species is either hy gemmation or by fission. In the first case the nucleus divides and the frag-. '. Fig. 40. Fio. 36. Fios. 34 to 40.—In the figures d denotes disk; o, peristome; vc, contractile vacuole; vf, food- vacuole; w, vestibule; c[, contractile fiber; c, cyst; wc, nucleus; c^, cilium. Fig. 34.—a group of vorticellse showing the crea- ture in various positions (A, 3). Fia. 35.—The same, in the extended and in the retracted state. (Surface views.) Pig. 36.—Shows food-vacuoles; one in the act of ingestion. Fig. 37.—A vorticella, in which the process of multiplication by fission is begun. Fig. 38.—The results of fission; the production of two individuals of unequal size. Fig. 39.—Illustration of reproduction by conju- gation. Fig. 40.—An encysted vorticella. , ments are transformed into locomotive germs; in the latter the entire animal, including the nucleus, divides longitudi- nally, each half becoming a similar complete, independent or- ganism. Still another method of reproduction is known. A more or less globular body encircled with a ring of cilia and of relatively small size may sometimes be seen attached to the usual form of Vorticella, with which it finally becomes blended into one mass. This seems to foreshadow the " sexual. 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 Mills, Wesley, 1847-1915. New York, Appleton
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