The Cell Outlines of General Anatomy And Physiology
The book The Cell Outlines of General Anatomy And Physiology was written by author Oscar Hertwig Here you can read free online of The Cell Outlines of General Anatomy And Physiology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Cell Outlines of General Anatomy And Physiology a good or bad book?
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Division of Plant Cells. The protoplasmic coating of the wall of. the embryo-sac of Fritillaria iviperiaUs affords an in- structive illustration of the great uniformity of the process of nuclear division as it occurs in plants and animals. This, as well as the embryo-sacs of other Liliaceas, is particularly suitable for the study of nuclear figures, for the layer of protoplasm is extremely thin, and, if examined at the right time, is seen to contain a large number of nuclei at various stages of... division (Strasburger VI. 71-73; GuignardVI. 23). The large resting nucleus contains a linin framework with small meshes (Fig. 93 A) 9 upon the surface of which a large number of small nuclein granules are pretty evenly distributed. In the majority of cases nucleoli are present. These vary in size, and lie between the meshes of the framework, to which they are attached. Strasburger is of opinion that, when the nucleus is preparing to divide, the whole framework becomes transformed into a few fairly thick threads, which are much twisted ; he de- scribes in them a diagonal striation (c) similar to that observed by Balbiani (II.
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