ADDITIONS AND COEEECTIONS. 



XI 



Fifth 

 Edition. 



Sixth 



Edition. 



Page 



326 



Page 

 vol. ii. 



28 



377 

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 440 

 463 



81 

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 172 



505 



218 



516 



232 



518 

 520 

 521 

 541 

 547 

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236 



237 

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568 



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572 



297 



Chief Additions and Corrections. 



On the causes of sterility of hybrids, added to and 



corrected. 

 Pyrgoma found in the chalk. 

 Extinct forms serving to connect existing groups. 

 On earth adhering to the feet of migratory birds. 

 On the wide geographical range of a species of 



Galaxias, a fresh-water fish. 

 Discussion on analogical resemblances, enlarged and 



modified. 

 Homological structure of the feet of certain mar- 

 supial animals. 

 On serial homologies, corrected. 

 Mr. E. Eay Lankester on morphology. 

 On the asexual reproduction of Chironomus. 

 On the origin of rudimentary parts, corrected. 

 Recapitulation on the sterility of hybrids, corrected. 

 Recapitulation on the absence of fossils beneath the 



Cambrian system, corrected. 

 Natural selection not the exclusive agency in the 



modification of species, as always maintained in 



this work. 

 The belief in the separate creation of species generally 



held by naturalists, until a recent period. 



