Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 327
d extension, as distin-guished from sexual generation) in one of two modes:—either (1)binary subdivision of the parent-cell, or (2) free cell-formation withinthe parent-cell.—The first stage of the former process consists inthe elongation and transverse constriction of the nucleus ; and… … Duplicative Subdivision of Cells in Endosperm of Seed ofScarlet-runner:—A, ordinary cell, with nucleus a, and nucleo-lus 6, imbeded in its protoplasm ;—B, cell showing subdivisionof nucleus into two halves, a and a;—c, cell in same stage,showing contraction of endoplasm (produced by addition…
Microscopy · Biology
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