Abstract
The DNA has been measured by Feulgen-photometry in individual nuclei in roots of “Cherry Blossom”, a diploid hyacinth (2 n = 16) and “Rosalic” which is trisomic for a nucleolar chromosome. A difference in value of C proportional to the length of the extra nucleolar chromosome was found. Comparable changes in the value of C for the two varieties were obtained after growing the plants at 15 °, 4 ° and −2 °C. The values were lowest after growth at 15 °C and highest after 4 °C.
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