. The cell in development and inheritance. Cells. PHYSIOLOGICAL RELATIONS OF NUCLEUS AND CYTOPLASM 343 stome. Lillie ('96) has recently found that Stcntor may by shaking be broken into fragments of all sizes, and that nucleated fragments as small as ^V ^^e volume of the entire animal are still capable of complete regeneration. All non-nucleated fragments perish. These studies of Nussbaum and Gruber formed a prelude to more extended investigations in the same direction by Gruber, Balbiani, Hofer, and especially Verworn Verworn ('88) proved that in Poly- stomella, one of the Foraminifera, nuclea
. The cell in development and inheritance. Cells. PHYSIOLOGICAL RELATIONS OF NUCLEUS AND CYTOPLASM 343 stome. Lillie ('96) has recently found that Stcntor may by shaking be broken into fragments of all sizes, and that nucleated fragments as small as ^V ^^e volume of the entire animal are still capable of complete regeneration. All non-nucleated fragments perish. These studies of Nussbaum and Gruber formed a prelude to more extended investigations in the same direction by Gruber, Balbiani, Hofer, and especially Verworn Verworn ('88) proved that in Poly- stomella, one of the Foraminifera, nucleated fragments are able to. B C Fig. 159. — Regeneration In the unicellular animal Stf>ifor. [From Gruber after Balbiani.] A. Animal divided into three pieces, each containing a fragment of the nucleus. B. The three fragments shortly afterward. 6". The three fragments after twenty-four hours, each regenerated to a perfect animal. repair the shell, while non-nucleated fragments lack this power. Balbiani ('89) showed that although non-nucleated fragments of Infusoria had no power of regeneration, they might nevertheless continue to live and swim actively about for many days after the operation, the contractile vacuole pulsating as usual. Hofer ('89), experimenting on Anuvba, found that non-nucleated fragments might live as long as fourteen days after the operation (Fig. 160). Their movements continued, but were somewhat modified, and little by little ceased, but the pulsations of the contractile vacuole were but slightly affected; they lost more or less completely the capacity to. 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York Macmillan
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1906
