CONTENTS. 



CHAPTEE XIV. 



Mutual Affinities of Organic Beings : Morphology : 

 Embryology : Eudimentary Oegans. 



Classification, groups subordinate to groups — Natural system — 

 Eules and difficulties in classification, explained on the theory 

 of descent with modification — Classification of varieties — 

 Descent always used in classification — Analogical or adaptive 

 characters — Affinities, general, complex, and radiating — Ex- 

 tinction separates and defines groups — Morphology, between 

 members of the same class, between parts of the same 

 individual — Embryology, laws of, explained by variations not 

 supervening at any early age, and being inherited at a 

 corresponding age — Eudimentary organs; their origin ex- 

 plained — Summary ., ,. .. Page 202 



CHAPTEE XY. 



Eecapitulation and Conclusion. 



Eecapitulation of the objections to the theory of Natural Selection 

 — Eecapitulation 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 

 extended — Effects of its adoption on the study of Natural 

 History — Concluding remarks .. , 267 



Glossary of Scientific Teems « 307 



Index .. .. , .. 323 



