. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 12 3 Fig. 19.—The "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 PLANE—^. MACRONUCLEUS MICRONUCLEUS Fig. 20.—Binary fission of a paramoecium. a
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 12 3 Fig. 19.—The "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 PLANE—^. MACRONUCLEUS MICRONUCLEUS Fig. 20.—Binary fission of a paramoecium. and at the same time a constriction appears about the animal. Di- vision is completed when the elongated nuclei have separated into two and the constriction has progressed to separate the parent ani-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buchanan, James William, 1888-. New York, London, Harper & brothers
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