Letter 7609 Darwin, C. R. to Greg, W. R. 21 Mar [1871] Summary Add + Comments on WRG's MS on ratio of the sexes at birth. + Offers to send J. M. A. Thury's paper ["Loi de production des sexes", Arch. Sci. Phys. & Nat. 18 (1863): 91–8]. Transcription The full text of this letter is not yet available online. Footnotes Add
