Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 590
cellina.441. Many, perhaps all, ciliated Infusoria at certain times undergoan encysting process, resembling the passage of Protophytes into the condition (§ 231), and apparently serving, like it, as a provi- still sion for their preservation under circumstances which do not permitthe continuance of…
Microscopy · Biology
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