Essays Upon Heredity And Kindred Biological Problems By Dr August Weismann Ed
Essays Upon Heredity And Kindred Biological Problems By Dr August Weismann Ed
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1881, p. 293) saj's in reference to the Infusoria, ' Un petit nombre d'especes, au lieu de se multiplier a I'etat de vie active, se reproduisent dans une sorte d'etat de repos, dit etat d'enkystement. Ces sortes de kystes peuvent etre designes sous le nom de kystes de reproduction, par opposition avec d'autres kystes, dans lesquels les Infusoires se renferment pour se soustraire a des conditions devenues defavorables du milieu qu'ils habitent, le manque d'air, le dessechement, etc. — ceux-ci so...nt des kystes de conservation . . . ' ^ This is of importance in so far as single individuals might be thus compelled to encyst even when the existing external conditions of life do not require it. The substance which Adinosphaeriiini, for example, employs in the secretion of its thick siliceous cyst must have been gradually accumulated by means of a process peculiar to the species. We can scarcely be in error if we assume that the silica accumulated in the organism cannot increase to an unlimited extent without injury to the other vital processes and that the secretion of the cyst must take place as soon as the accumulation has exceeded a certain limit.
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To quickly assess the difficulty of the text, read a short excerpt:
1881, p. 293) saj's in reference to the Infusoria, ' Un petit nombre d'especes, au lieu de se multiplier a I'etat de vie active, se reproduisent dans une sorte d'etat de repos, dit etat d'enkystement. Ces sortes de kystes peuvent etre designes sous le nom de kystes de reproduction, par opposition avec d'autres kystes, dans lesquels les Infusoires se renferment pour se soustraire a des conditions devenues defavorables du milieu qu'ils habitent, le manque d'air, le dessechement, etc. — ceux-ci so...nt des kystes de conservation . . . ' ^ This is of importance in so far as single individuals might be thus compelled to encyst even when the existing external conditions of life do not require it. The substance which Adinosphaeriiini, for example, employs in the secretion of its thick siliceous cyst must have been gradually accumulated by means of a process peculiar to the species. We can scarcely be in error if we assume that the silica accumulated in the organism cannot increase to an unlimited extent without injury to the other vital processes and that the secretion of the cyst must take place as soon as the accumulation has exceeded a certain limit.
What to read after Essays Upon Heredity And Kindred Biological Problems By Dr August Weismann Ed?
You can find similar books in the "Read Also" column, or choose other free books by Sed20translationbookmark to read onlineMoreLess
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