. Elementary botany. Botany. GAMETOPHYTE AND SPOKOPHYTE. 341 the nucleus, giving rise to a succession of nuclear figures presented by a definite but variable series of evolutions on the part of the nuclear substance. This is indirect division of the nucleus, or karyokinesis. Indirect division of the nucleus is the usual method, and it occurs in the normal growth and division of the cell. The nuclear figures which are formed in the division of the mother cell into the four spores are somewhat different from those occurring in vegetative division, but their study will serve to show the general c
. Elementary botany. Botany. GAMETOPHYTE AND SPOKOPHYTE. 341 the nucleus, giving rise to a succession of nuclear figures presented by a definite but variable series of evolutions on the part of the nuclear substance. This is indirect division of the nucleus, or karyokinesis. Indirect division of the nucleus is the usual method, and it occurs in the normal growth and division of the cell. The nuclear figures which are formed in the division of the mother cell into the four spores are somewhat different from those occurring in vegetative division, but their study will serve to show the general character of the process. 679. Chromatin and linin of the nucleus.—In figure 404 is represented a pollen mother cell of the May-apple (podophyl-. Fig. 404- Pollen mother cell of podophylUini, rest- ingnucleus. Cliroma- tin forming a net- work. (Figures 404-406 Fig. 405. Rpirem stage of nucleus. nn, nuclear cavity; n, nu- cleolus; .i/, spirem. Fig. 406. Forming spindle, threads from proto- plasm with several poles, roping the chromosomes up to nuclear plate. after Mottier.) lum). The nucleus is in the resting stage. There is a network consisting of very delicate threads, the linin network. Upon this network are numerous small granules, and at the junction of the threads are distinct knots. The nucleolus is quite large and prominent. The numerous small granules upon the linin stain very deeply when treated with certain dyes used in differentiating the nuclear structure. This deeply staining substance is tht; chromatin of the nucleus,. 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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