. Biology . Fig. 27.—Paramecium caudahim in the condition of depression and recoverythrough the use of salts. The individual on the left has densely packed proto-plasm, the others were similar individuals which were treated with potassiumphosphate. From photographs of prepared specimens. Reproduction.—^Like Amoeba proteus and the flagellates,Paramecium reproduces by simple division, the micronucleusdividing first. The cell divides transversely through themiddle of the macronucleus which is passively divided with therest of the cell (Fig. 28). One new mouth and new contractilevacuoles are forme
. Biology . Fig. 27.—Paramecium caudahim in the condition of depression and recoverythrough the use of salts. The individual on the left has densely packed proto-plasm, the others were similar individuals which were treated with potassiumphosphate. From photographs of prepared specimens. Reproduction.—^Like Amoeba proteus and the flagellates,Paramecium reproduces by simple division, the micronucleusdividing first. The cell divides transversely through themiddle of the macronucleus which is passively divided with therest of the cell (Fig. 28). One new mouth and new contractilevacuoles are formed by the daughter cells which separate andbegin an independent existence. The entire process requiresfrom half an hour to two hours according to the temperature. Irritability.—Like A moeba proteus again, Paramecium respondsto external stimuli, but having definite motile organs its re-sponses are more definite and more easily studied. It answers PARAMECIUM CAUDATUM 65 to all sudden stimuli by a definite
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