. The Bible and science. Fig. 11.—Multiplication of a cell by subdivision. divide at the nucleus. This splits into two, andeach half becomes rounded like the parent Fig. 12.—Growing point of a stem, showing the mode of growth by subdivisionof cells. Next the protoplasm begins to divide, and the cellwall sends in a little projection between the dividing F 66 GROWTH OF TWIG. portions, wliich becomes larger and larger until itforms a complete partition, and thus we have twodistinct cells. Each of these may go on dividing asbefore, and thus we get cellular tissue increasing bothin length
. The Bible and science. Fig. 11.—Multiplication of a cell by subdivision. divide at the nucleus. This splits into two, andeach half becomes rounded like the parent Fig. 12.—Growing point of a stem, showing the mode of growth by subdivisionof cells. Next the protoplasm begins to divide, and the cellwall sends in a little projection between the dividing F 66 GROWTH OF TWIG. portions, wliich becomes larger and larger until itforms a complete partition, and thus we have twodistinct cells. Each of these may go on dividing asbefore, and thus we get cellular tissue increasing bothin length and in thickness. We have already noticed, however, that the oaktwig was not composed of cells alone, but tliat itcontained many different bodies, some tubular, somespindle-shaj)ed, and some oblong or hexagonal. Thesebodies were all originally cells but some of them havebecojne much modified during the progress of growthand others have actually become converted into the cells grow older they generally increase in thick-ness, and may also become modified in shape. In thehexagonal cells of the pith, the protoplasm, afterbuilding the cell wall, dies and dis
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectnaturalhistory, booky
