CONTENTS. 



PAGE 



Preface v 



Table of Contents ix 



List of Illustrations . . . . xiii 



Introduction i 



PART I. THE NATURE OF VARIATION. 



Preliminary iQ 



Chapter I. Variation. 



Preliminary 5^5v 



I. Variations of Specific Characters 25 



a. Variations in Cicindela 25 



b. Variations in Osceola doliata 29 



c. Color- Variations in Cnemidophorus 41 



d. Variations in North American Birds and Mam- 



mals in Relation to Locality 45 



Variation of Structural Characters 58 



Successional Relation 62 



2. 

 3- 



Chapter II. Phylogeny. 



1. General Phylogeny .... 



2. Phylogeny of the Vertebrata . 



a. Phylogeny of the Classes 



b. The Line of the Pisces 



c. The Line of the Batrachia 



d. The Line of the Reptilia. 



e. The Line of the Aves 

 /. The Line of the Mammalia 

 g. Review of the Phylogeny of the Mammalia 



83 

 83 

 99 

 108 



113 

 123 

 126 



138 



