Erythrism in the Eggs of British Birds.

ALTHOUGH many scattered notes on this subject may be found in the various ornithological journals, very little has hitherto been done to collect these separate records; and beyond a short note by Adolf Kricheldorff in the Zeitschrift fur Oologie, XIII., Jahrg., p. 10 (1903), " Ueber vote Variationen der Vogeleier," and a paper by F. C. R. Jourdain " On Colour Variation in the Eggs of Palsearctic Bir...