. Advanced biology. Biology; Physiology; Reproduction. 56 THE RESTING AND DIVIDING CELL. Physiologically — it lives, moves, reproduces, and dies. If kept under proper conditions, such as Woodruff and Carrell kept it in their experiments, protoj)lasm seems to be able to live indefinitelv. Dr. Calkins, of Columbia Uni- versity, has performed many experi- ments on certain cells to show the importance of the presence of nuclear material. In one experi- ment he used Urouychia, a one- celled animal. Like its relative, Paramecium, this creature has two nuclei, a macronucleus and a micro- nucleus. The
. Advanced biology. Biology; Physiology; Reproduction. 56 THE RESTING AND DIVIDING CELL. Physiologically — it lives, moves, reproduces, and dies. If kept under proper conditions, such as Woodruff and Carrell kept it in their experiments, protoj)lasm seems to be able to live indefinitelv. Dr. Calkins, of Columbia Uni- versity, has performed many experi- ments on certain cells to show the importance of the presence of nuclear material. In one experi- ment he used Urouychia, a one- celled animal. Like its relative, Paramecium, this creature has two nuclei, a macronucleus and a micro- nucleus. The protozoologist divided the tiny creature into two fragments, each having an equal part of the macronucleus and micronucleus. Both parts healed. Both grew and reproduced. Then he divided a second organism unequally so that the smaller olied An amoeba was cut apart, one portion bearing the nucleus. Both fragments healed, both continued to move, but the one without a nucleus soon slowed down, came to rest, and died. The nucleated portion grew and became a normal 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 Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Book Company
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