. The cell in development and inheritance. Cells. Fig. 38. — Mitotic division in Infusoria. [R. Hertvvig.] A-C. Macronucleus of Spirochona, showing pole-plates. D-H. Successive stages in the division of the micronucleus of/'(Z/-rt7«£i'i'/«w. D. The earliest stage, showing reticulum. G. Fol- lowing stage (" sickle-form ") with nucleolus. E. Chromosomes and pole-plates. F. Late ana- phase. H. Final phase. the nuclear membrane may persist more or less completely through every stage {^Noctilnca, EnglypJia, Actinosp/icenjun). 2. Asters may be present (Hehozoa, gregarines) or wanting (In-
. The cell in development and inheritance. Cells. Fig. 38. — Mitotic division in Infusoria. [R. Hertvvig.] A-C. Macronucleus of Spirochona, showing pole-plates. D-H. Successive stages in the division of the micronucleus of/'(Z/-rt7«£i'i'/«w. D. The earliest stage, showing reticulum. G. Fol- lowing stage (" sickle-form ") with nucleolus. E. Chromosomes and pole-plates. F. Late ana- phase. H. Final phase. the nuclear membrane may persist more or less completely through every stage {^Noctilnca, EnglypJia, Actinosp/icenjun). 2. Asters may be present (Hehozoa, gregarines) or wanting (In- fusoria, Radiolaria). 3. In one series of forms the centrosome or sphere is represented by a persistent intranuclear body (nucleolo-centrosome) of consider- able size, which divides to form a kind of central spmdle {Englcna Aniceba, Infusoria.'). 4. In a second series the centrosome or sphere is a persistent. 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
