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In evaluating the dependence of the free energy of the DNA component upon the concentration of CsCl the effect of solvation was neglected. It can be shown that solvation may introduce an error into the apparent molecular weight if either CsCl or water is bound preferentially. A method for estimating the error due to such selective solvation will be presented elsewhere."},{"key":"e_1_3_1_13_2","unstructured":"In addition to NH 4 Cl this medium consists of 0.049 M Na 2 HPO 4 0.022 M KH 2 PO 4 0.05 M NaCl 0.01 M glucose 10 \u22123 M MgSO 4 and 3 \u00d7 10 \u22126 M FeCl 3 ."},{"key":"e_1_3_1_14_2","unstructured":"This result also shows that the generation time is very nearly the same for all DNA molecules in the population. This raises the questions of whether in any one nucleus all DNA molecules are controlled by the same clock and if so whether this clock regulates nuclear and cellular division as well."},{"key":"e_1_3_1_15_2","doi-asserted-by":"publisher","DOI":"10.1098\/rspa.1954.0101"},{"key":"e_1_3_1_16_2","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.3.5.767"},{"key":"e_1_3_1_17_2","first-page":"532","volume-title":"The Chemical Basis of Heredity","year":"1955","unstructured":"For reviews see D. O. Jordan, in The Nucleic Acids, ed. E. Chargaff and J. D. Davidson (New York: Academic Press, 1955), 1, 447; and F. H. C. Crick, in The Chemical Basis of Heredity, ed. W. D. McElroy and B. 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