The Sex-Ratio

AT the recent Nottingham meeting of the British Association, the first morning was devoted by Section D (Zoology) to a symposium on the sex-ratio. This was introduced by Prof. F. A. E. Crew's presidential address, which reviewed the subject in detail and formed an essential part of the discussion as a whole. A number of the facts brought forward by the speakers, and the conclusions drawn from them, merit the attention both of general biologists and of those interested in the various aspects of the population problem.