X CONTENTS 



VII. THE SINGLE-CELLED ANIMAL BODY; PROTOPLASM 



AND THE CELL. 

 The single-celled animal body, 36. The cell, 37. Protoplasm, 39. 



VIII. -CELLULAR STRUCTURE OF THE TOAD (OR FROG). 

 [Laboratory exercise], 40. The blood, 40. The skin, 40. The liver. 

 41. The muscles, 41. 



IX. THE MANY-CELLED ANIMAL BODY; DIFFERENTIATION 



OF THE CELL. 

 The many-celled animal body, 43. Differentiation of the cell, 43. 



X. HYDRA. 

 [Laboratory exercise], 46. 



XL THE SIMPLEST MANY-CELLED ANIMALS. 



Cell-differentiation and body-organization in Hydra, 52. Degrees in 

 cell-differentiation and body-organization, 54. 



XII. DEVELOPMENT OF THE TOAD. 

 [Field and laboratory exercise], 55. 



XIII. MULTIPLICATION AND DEVELOPMENT. 



Multiplication, 57 Spontaneous generation, 58. Simplest multiplica- 

 tion and development, 59. Birth and hatching, 61. Life-history, 62. 



PART II 



SYSTEMATIC ZOOLOGY 



XIV. THE CLASSIFICATION OF ANIMALS. 



[Laboratory exercise and recitation], 65. Basis and significance 01 

 classification, 65. Importance of development in determining classification, 

 67. Scientific names, 68. An example of classification, 68. Species, 

 69. -Genus, 70. Family, 72. Order, 72. Class and branch, 73. 



XV. BRANCH PROTOZOA : THE ONE-CELLED ANIMALS. 

 EXAMPLE : THE BELL ANIMALCULE (VORTICELLA SP.) [Laboratory 

 exercise], 75. 



OTHER PROTOZOA. 



Form of body, 78. Marine Protozoa, 80. 



