[{309}] In the Origin, Ed. i. p. 280, vi. p. 414 he uses his newly-acquired knowledge of pigeons to illustrate this point.
[{310}] Compare the Origin, Ed. i. p. 281, vi. p. 414.
[{311}] Origin, Ed. i. p. 301, vi. p. 440.
[{312}] Origin, Ed. i. p. 329, vi. p. 471.
[{313}] The structure of the Pachyderm leg was a favourite with the author. It is discussed in the Essay of 1842, p. 48. In the present Essay the following sentence in the margin appears to refer to Pachyderms and Ruminants: “There can be no doubt, if we banish all fossils, existing groups stand more separate.” The following occurs between the lines “The earliest forms would be such as others could radiate from.”
[{314}] Origin, Ed. i. p. 307, vi. p. 448.
[{315}] «Pencil insertion by the author.» The parent-forms of Mollusca would probably differ greatly from all recent,—it is not directly that any one division of Mollusca would descend from first time unaltered, whilst others had become metamorphosed from it.
[{316}] Origin, Ed. i. p. 291, vi. p. 426.
[{317}] «Note in original.» Reflect on coming in of the Chalk, extending from Iceland to the Crimea.
[{318}] Origin, Ed. i. p. 282, vi. p. 416.