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- W580557788 abstract "In a former paperr I called attention to the fact that many species of hydroids change their structural type with age, that is, in the direction of their growth. Stems straight proximally may become sinuous distally. Biranches which alternate during the early stages of colonial development may later originate in pairs. Length and annulation of hydrothecal pedicels, size, proportions and ornamentation of hydrothecae may similarly vary with the distance from the base of stem or branch. An attempt to analyze the problems in differentiation suggested by these facts was begun, upon a species of campanularian peculiarly well adapted for experimentation. The results reached favored the view that the progressive changes in the differentiation of the individuals of a colony are not dependent upon changes of external conditions, but upon changes of internal conditions; and that these changes are of a physiological character, and do not lead to a conception of morphological determinants or residual germ plasim. The bearing of the facts upon the problem of senescence was also suggested. For, on the stem of such a hydroid as Caimpanulariawith a cymose type of budding-the individuals appear as successive generations, forming, at the same time, parts of the whole colony. Accordingly, a comparison of any two individuals might be expected to show a difference in their structure corresponding in some degree to a period of physiological change in the colony equal to their difference in age. Since the publication of these results, several important papers have appeared expressing radically different views on the relation of natural death and development. Minot (Pop. Sc. Mo., Nov., I907, p. 472) holds that as cells differentiate they lose something of their capacity to live. Loeb (Pfluger's Arch., I24, 1908, p. 41 I), after stating this conclusion in chemical terms as follows: UUniv. Cal. Publ., Zo6logy, 2, p. 323." @default.
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- W580557788 date "1910-02-01" @default.
- W580557788 modified "2023-09-25" @default.
- W580557788 title "DIFFERENTIATION IN HYDROID COLONIES. II. AGLAOPHENIA" @default.
- W580557788 doi "https://doi.org/10.2307/1536100" @default.
- W580557788 hasPublicationYear "1910" @default.
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