Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] PROTOZOA 181 Reproduction of Paramcecium. — Somctimos a paramoecium may be found in the act of dividing by the process known as fission, to form two new cells, each of which contains half of the oiigi- nal cell. This is a method of asexual reproduc- tion. Frequently another method of reproduction may be observed. This is called conjugation and some- what resembles the same process in the thallo- phytes. Two cells of equal size at
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] PROTOZOA 181 Reproduction of Paramcecium. — Somctimos a paramoecium may be found in the act of dividing by the process known as fission, to form two new cells, each of which contains half of the oiigi- nal cell. This is a method of asexual reproduc- tion. Frequently another method of reproduction may be observed. This is called conjugation and some- what resembles the same process in the thallo- phytes. Two cells of equal size attach themselves as shown below, complicated changes take place in the nuclei of the two cells thus united, and after a short period of rest the two cells separate as two new individuals. These new animals appear to be rejuvenated as a result of conjugation, and may continue to reproduce asexU' ally by fission for a long period of time. Even- ually, howeve--, it seems necessary for the cells to conjugate in order to continue their existence. This stage of conjugation we believe in the plants to be a sexual stage. There seems every reason to believe that it is a like stage in the life history of the paramoecium. NAC. M/C. Paramoecium dividing by fission. Greatly magni- fied. M, mouth; MAC, macronucleus; MIC, micronucleus. (After Sedgwick and Wilson.)
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