TABLE OF CONTENTS 



FASB 



Intboduction , . . . ix 



CHAPTER I 



The Peoblem: The Mode op its Solution ... 1 



The question. — The two theories of man's origin. — The argument purely 

 historical. — Means of tracing man's ancestry and history. — Classification. 

 — Ontogenesis and Phylogenesis. 



GHAPTEE II 



Protozoa to Worms : Cells, Tissues, and Organs . 32 



Amoeba : Its anatomy and physiology. — Development of the cell. — 

 Hydra : The development of digestive and reproductive organs, and of 

 tissues. — Forms intermediate between amceba and hydra : Magosphsera, 

 volvox. — Embryonic development. — Turbellaria ; Appearance of a body 

 wall, of ganglion, and nerve-cords. 



CHAPTER III 



Worms to Vertebrates: Skeleton and Head . 55 



Worms and the development of organs. — MoUusks : The external protec- 

 tive skeleton leads to degeneration or stagnation. —Annelids and arthro- 

 pods : The external locomotive skeleton leads to temporary rapid advance, 

 but fails of the goal.— Its disadvantages. — Vertebrates : The internal loco- 

 motive skeleton leads to backbone and brain. — Reasons for their dominance 

 — The primitive vertebrate. 



