. Animal physiology. Physiology, Comparative. TWO PRINCIPAL MODES OF REPRODUCTION. 553 Mosses, and Hepaticae, as well also the " zoospores " of Algae, belong to the same class of reproductive bodies. The gemmae of Phanerogamia may be developed in connexion with the parent structure, and may continue to form a part of it; or they may be removed from it (as in the processes of budding, grafting, (^c), and may be developed into new individuals.— On the other hand, the bodies of the second class are known as seeds amonjjj Flowering Plants the Cryptogamia they present a variety of forms.
. Animal physiology. Physiology, Comparative. TWO PRINCIPAL MODES OF REPRODUCTION. 553 Mosses, and Hepaticae, as well also the " zoospores " of Algae, belong to the same class of reproductive bodies. The gemmae of Phanerogamia may be developed in connexion with the parent structure, and may continue to form a part of it; or they may be removed from it (as in the processes of budding, grafting, (^c), and may be developed into new individuals.— On the other hand, the bodies of the second class are known as seeds amonjjj Flowering Plants the Cryptogamia they present a variety of forms. From the very first, these are destined to produce new individuals ; and although they are often assisted in the early stage of their development by the parent, they are its true offspring, rather than (like gemma?) extensions of itself. Both these modes of Reproduc- tion, namely, gemmation and sexual generation, exist in the Animal Kingdom ; but the former is confined to its lower tribes, among which we often find it exercised in very remark- able modes. Gemmiparous or Non-Sexual Jtej^rodiiction. 725. Among Infusoria (§ 133) we find the process of gem- mation, or of fission, which is a modification of it, to be almost the only ostensible means of propagation which the beings composing that wonderful group possess. The former may be continually witnessed by the microscopic observer in the common Vorticella, a bell-shaped animalcule attached by a stalk b. Fig. 295.—Various forms ok Animalcules, some of them undergoing spon- taneous fission. (fig. 295, a, a), and abundant in almost every pool in wliich aquatic vegetables grow, especially clustering around the stems of Duckweed; and its various stages closely resemble those. 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 Carpenter, William Benjamin, 1813-
Size: 2117px × 1180px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarpente, bookcentury1800, bookdecade1850, bookyear1859
