Abstract
IT has been suggested1,2 that the deoxyribonucleic acid content of Trillium chromosomes in the roots falls after cold treatment, and that the competition for available nucleic acid often leads to starvation of the heterochromatic segments. Photometric determinations of the Feulgen stain content of nuclei before and after cold treatment3,4 support this view. We have now made estimations of the deoxyribonucleic acid content in root tips of Vicia, Trillium and Paris, both with and without cold treatment (Tables 1–3). In each case, terminal 1-cm. segments were used.
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