CONTENTS 



PART I 



STRUCTURE, FUNCTIONS, AND DEVELOPMENT OF 



ANIMALS 



I. THE STUDY OF ANIMALS AND THEIR LIFE. 



Our familiar knowledge of animals and their life, I. Zoology and its 

 divisions, 2. A first course in Zoology, 3. 



II. THE GARDEN TOAD (Buro LEXTIGINOSUS). 

 [Laboratory exercise], 5. External structure, 5. Internal structure. 7. 



III. THE STRUCTURE AND FUNCTIONS OF THE ANIMAL BODY. 



Organs and functions, 14. The animal body a machine, 14. The essen- 

 tial functions or life-processes, 15. 



IV. THE CRAYFISH (CAMBARUS SP.). 

 [Laboratory exercise], 17. External structure, 17. Internal structure, 21. 



V. THE MODIFICATION OF ORGANS AND FUNCTIONS. 



Difference between crayfish and toad, 26. Ref-emblances between cray- 

 ri-li and toad, 27. Modification of functions and structure to fit the animal 

 to the special conditions of its life, 29. Vertebrate and invertebrate, 30. 



VI. AMCEBA AND PARAMCLCIUM. 



[Laboratory exercise], 31. Amoeba, 31. The slipper-animalcule (PARA- 

 MCECIUM SP.), 34. 



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