CONTENTS. 



CHAPTER XIV. 



mutual affinities of organic beings t moepholoot : 

 embryology: rudimentary organs. 



Classification, groups subordinate to groups — Natural system — 

 Rules and diflSculties in classification, explained on the theory 

 of descent with modification — Classification of varieties — De- 

 scent always used in classification — Analogical or adaptive char- 

 acters—Affinities, general, complex, and' radiating — Extinction 

 separates and defines groups — Morphology, between members 

 of the same class, between parts of the same individual — 

 Embryology, laws of, explained by variations not super- 

 vening at an early age, and being inherited at a correspond- 

 ing age — Rudimentary organs : their prigin explained — Sum- 

 mary Page 202 



CHAPTER XV. 



recapitulation and conclusion. 



Recapitulation of the objections to the theory of Natural Selection 

 — Recapitulation of the general and special circumstances in its 

 favour — Causes of the general belief in the immutability of 

 species — How far the theory of Natural Selection may be ex- 

 tended — Effects of its adoption on the study of Natural History 

 — Concluding remarks ....... 267 



Glossary of Scientific Terms 307 



2ndez •!••• 323 



