CONTENTS 6 



CHAPTEE XIV 



MUTUAL AFFINITIES OF ORGANIC BEINGS: MORPHOLOGY: 

 EMBRYOLOGY: RUDIMENTARY ORGANS 



Classification, groups subordinate to groups — Natural system — Rules 

 and diflBculties in classification, explained on the theory of descent with 

 modification — Classification of varieties — Descent always used in classi- 

 fication — Analogical or adaptive characters — Affinities, general, com- 

 plex, and radiating — Extmetion 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 an early age, and being inherited at a corresponding age 

 — Rudimentary organs; their origin explained — Summary . . 211 



CHAPTER XV 



RECAPITULATION AND CONCLUSION 



Recapitulation of the objections to the theory of Natural Selection — Re- 

 capitulation of the general and special circumstances in its favor — 

 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 .... 2'?6 



Glossary of Scientific Terms ... .... 31t 



Index , , , , c . 337 



