[124] "Animals and Plants under Domestication," vol. ii. p. 104.
[125] North British Review, New Series, vol. vii., March 1867, p. 317.
[126] "Origin of Species," 5th edition, 1869, p. 212.
[127] See also the Popular Science Review for July 1868.
[128] A bird with a keeled breast-bone, such as almost all existing birds possess.
[129] "Anatomy of Vertebrates," vol. iii. p. 792.
[130] Ibid. p. 793.
[131] As a tadpole is the larval form of a frog.
[132] As Professor Huxley, with his characteristic candour, fully admitted in his lecture on the Dinosauria before referred to.
[133] "Transactions of the Geological Society of Glasgow," vol. iii.