TABLE OF CONTENTS— Concluded 



Page 

 CHAPTER XVI 



THE PLANT-WORLD CONTINUED— The Three Higher Groupings— 

 Bryophytes — Outline of Life History of Sphagnum — Pteridophytes — 



Spermatophytes — Plant Histology — Pollination — Flowers 216-247 



CHAPTER XVII 



THE COELENTERATA— Hydra Fusca— Obeiia— Polymorphism— Classi- 

 fication 248-258 



CHAPTER XVIII 



INTRODUCTION TO THE COELOMATA 259-262 



CHAPTER XIX 



THE EARTHWORM— External Appearance— Internal Structure— The 

 Digestive System — The Circulatory System — Respiration — The Excre- 

 tory System — The Nervous System — Sense Organs — The Reproduc — 

 tive System — Oogenesis — Embryology — Behavior — Regeneration — 



Grafting 263-285 



CHAPTER XX 



FLATWORMS (PLATYHELMINTHES AND THREADWORMS 

 (NEMATHELMINTHES)— The Flatworms— Turbellaria— Trematoda 

 — Cestoda — The Threadworms — Nematoda — Intermediate and Uncer- 

 tain Forms 286-312 



CHAPTER XXI 



THE ARTHROPODA — The Crayfish — External Appearance — Serial 

 Homologies and Adaptations — The Digestive System — The Circulatory 

 System — The Respiratory System — The Excretory System — The Ner- 

 vous System — The Special Sense Organs — Muscular System — Reproduc- 

 tion — Regeneration — Autotomy — Parasitic Crustacea — Plankton — Ter- 

 restrial Crustaceans 313-328 



CHAPTER XXII 



INSECTS AT LARGE 329-332 



CHAPTER XXIII 



THE GRASSHOPPER— Importance of Insect Pests— External Appear- 

 ance — Internal Anatomy — The Digestive System — The Circulatory Sys- 

 tem — The Respiratory System — The Excretory System — The Nervous 

 System — The Senses of Insects — Touch — Taste — Smell — Hearing — The 

 Muscular System — The Reproductive System — Paedogenesis — Polyem- 



bryony — Alternation of Generations — Embryology — Behavior 333-353 



CHAPTER XXIV 



THE HONEY BEE AND THE FLY— External Appearance of Honey 

 Bee — Internal Anatomy and Physiology — The Digestive System — The 

 Circulatory System — The Respiratory System — The Excretory Sys- 

 tem — The Nervous System — Organs of Special Sense — The Muscular 

 System — The Reproductive System — Embryology — Metamorphosis — 

 Behavior — Enemies of The Honey Bee — Gynandromorphs — Cross Ferti- 

 lization of Plants by Bees — Classification — The Fly — Life History — Fly 



Killers — Parasitic Insects 354-375 



CHAPTER XXV 



HISTORY OF BIOLOGY— The Most Notable Men and Writings in 



Biology — Chronological Table of Important Biological Events 376-393 



CHAPTER XXVI 



PALEONTOLOGY — Geological Formations — Meaning of Ages or Periods 

 — Chart Showing Geological Depths and Ages — Types of Fossils — Early 



Human Bones 394-402 



CHAPTER XXVII 



EVOLUTION — The Different Theories of Evolution — Evidences for 

 Evolution — Opposing Arguments — Summary — Criteria for a Satisfac- 

 tory Evolutionary Theory 403-415 



CHAPTER XXVIII 



CLASSIFICATION— The Earliest Classifiers— Present Method— Tabular 

 View of the Classification of Animals as Far as Orders — Groups of 

 Invertebrates of More or Less Uncertain Systematic Position — Brief 

 Characterizations of the Major Groups of Animals and of Invertebrate 

 Groups of Uncertain Position 416-435 



INDEX-GLOSSARY 437-483 



