In a recent publication of ours on cell water density in amphibian eggs (Hansson Mild, Løvtrup & Forslind, 1979), the relation between the egg density, ρ, and the water content was established experimentally. It was then assumed that ρ could be theoretically related to the cell water density, ρω, and the density of the solids in the cell, ρs, on a weight average basis (equation (10) in Hansson Mild et al. 1979). However, this assumption is not correct, a fact which has been brought to our attention by Drs W. Drost-Hansen and J. Clegg (personal communication, 1980). Instead the egg density should be related to ρω and ρs on the basis of volume fractions as derived below.

© 1981 by Company of Biologists
1981
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