Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 >»>â 12 3 Fig. 19.âThe 'trial and error' method of solving difficulties as illustrated by the attempts of a paramaecium to pass by an obstacle. (After Jennings: Behavior of the Lower Organisms. Columbia University Press.) Reproduction in Paramoecium. Paramcecium reproduces by binary fission (Fig. 20). Preceding division, the oral groove dis- appears. Both the macronucleus and the micronucleus elongate DIVISION PLANEâ^

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