CONTENTS 



PAGE 

 1 



NATURAL HISTORY 



CHAPTER 



I. The Stage Settin"g (Ecology) 



II. The Biological Conquest of the Would . . . 20 



III. The Interdependence of Living Things — The Web of 



Life 44 



IV. Roll Call (33 



FUNDAMENTALS OF STRUCTURE AND FUNCTION 



V. Life and Protoplasm 

 VL Cells and Tissues 



125 



138 



ORGANISMS ILLUSTRATING BIOLOGICAL PRINCIPLES 



VII. Beginnings: The Large Group of the Smallest Organlsms 



VHI. The Development of Sexuality in Plants 



IX. Division of Labor in Coelenterates 



X. Being a Worm 



XI. The Popular Insect Plan . 



NIL The Art of Parasitism 



XIII. Advantages of Being a Vertebrate 



151 

 lf)8 

 17!i 

 187 

 199 



.) 



233 



THE MAINTENANCE OF THE INDIVIDU.VL 



XIV. The Role of Green Plants 



XV. The Metabolic Machinery of Animals 



XVI. Support, Motion, and Sensation 



XVII. The Display of Energy 



XVIII. Chemical Regulators 



237 

 274 

 32() 

 3C.4 

 390 



THE MAINTENANCE OF SPECIES 



XIX. Reproduction and Life Cycles 

 XX. The Great Relay Race 



IX 



405 

 434 



IS 



