The cell doctrine : its history and present state for the use of students in medicine and dentistry also, a copious bibliography of the subject / by James Tyson.

  • James Tyson
Date:
1870
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Licence: Public Domain Mark

Credit: The cell doctrine : its history and present state for the use of students in medicine and dentistry also, a copious bibliography of the subject / by James Tyson. Source: Wellcome Collection.

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    tion. And in his third series, p. 529, he says, “ The germinal vesicle does not burst, or dissolve away, or become flattened on or before the fecundation of the ovum as hitherto supposed. It ceases to be pellucid.” And on page 531, “The germinal vesicle fills with cells, and these become filled with the foundations of other cells; so that the germinal vesicle is gradu- ally rendered opaque.” He also describes in this series, in great detail, the mode in which these cells are produced from the germinal spot, which he considers in the light of a nucleus to the germinal vesicle. Part II, 1839, p. 360. And though the minute details may not precisely accord with those of the most recent observations, the correct idea is clearly grasped. In fact, it may be said that in minuteness of detail alone does he differ from later observers, and had he simply stated that the young cells arise from the nucleus or nucleolus of the parent cell, he would accord precisely with the most recent observers. But he is, if possible, even more explicit when he says, “The process inherited from the germinal vesicle by its offspring, reappears in the descendants of these. Every cell, whatever its minuteness, if its interior be discerned, is filled with the foundations of new cells, into which its nucleus has been resolved.” Again he says,* “ Schleiden has seen the nucleus undergoing such changes (division), but failed to recognize them.” And finally, in “Phi- losophical Transactions” for 1841, pp. 207-8, we have the following striking paragraphs, which would seem also to correct some previous errors: * Barry, Philosophical Transac., 1840, p. 348, \ 385.
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