Abstract
Methods are described and evaluated for isolating macronuclei from individual specimens of Paramecium aurelia and for measurement of dry weight with the scanning interference microphotometer and of ultraviolet absorption with the scanning ultramicrospectrograph. The growth of the macronucleus from one division to the next was followed. Dry weight and ultraviolet absorption both increase mainly during the second half of the interval, paralleling the increase in Feulgen-staining material reported earlier. It is concluded that all major components of the macronucleus, i.e., chromosomes, nucleoli, and ground substance, increase more or less simultaneously and discontinuously. The discontinuous nature of nuclear growth contrasted with the continuous nature of cytoplasmic growth suggests that immediate control of the rate of the latter resides in the cytoplasm, although long-term control must stem from the nucleus.
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