. Biology . FERTILIZATION TWO CONSECUTIVE DIVISIONSGIVING FOUR NORMAL CELL5. Fig. 30.—Diagram of the consecutive stages in conjugation of Paramecium caudatiim. Investigations subsequent to those of Biitschli have revealedall the happenings during the process, of conjugation in Para-mecium. The micronuclei in each cell first begin to swell bythe absorption of fluids from the endoplasm; the chromatin 74 ORGANISMS OF ONE CELL increases enormously in quantity and becomes drawn out inthe form of rods termed chromosomes, too numerous to of these chromosomes is then divided into two equal
. Biology . FERTILIZATION TWO CONSECUTIVE DIVISIONSGIVING FOUR NORMAL CELL5. Fig. 30.—Diagram of the consecutive stages in conjugation of Paramecium caudatiim. Investigations subsequent to those of Biitschli have revealedall the happenings during the process, of conjugation in Para-mecium. The micronuclei in each cell first begin to swell bythe absorption of fluids from the endoplasm; the chromatin 74 ORGANISMS OF ONE CELL increases enormously in quantity and becomes drawn out inthe form of rods termed chromosomes, too numerous to of these chromosomes is then divided into two equal parts,after which the micronuclei divide through the center, eachdaughter micronucleus receiving one-half the original chroma-tin. There are now two micronuclei in each cell, and all fourdivide once again, forming eight in all or four in each cell. Ofthese four, three degenerate and are absorbed in the endoplasm,leaving one micronucleus in each cell. These then divide onceagain, forming what are called pronuclei, one of which migratesfrom its cell into the other cell so
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