Note 68 — Chapter VII · FOWLS.
Reading edition
See Mr. Tegetmeier’s account with woodcuts of the skull of Polish fowls in ‘Proc. Zoolog. Soc.,’ Nov. 25th, 1856. For other references, see Isid. Geoffroy Saint-Hilaire, ‘Hist. Gén. des Anomalies,’ tom. i. p. 287. M. C. Dareste suspects (‘Recherches sur les Conditions de la Vie,’ etc., Lille 1863, p. 36) that the protuberance is not formed by the frontal bones, but by the ossification of the dura mater.