xiv LIST OF ILLUSTRATIONS 



FIG. PAGE 



27. MALE AND FEMALE BIRD OF PARADISE . . 104 



28. GELASIMUS OR FIDDLER GRAB . . . 106 



29. MALE SPIDERS DISPLAYING THEMSELVES . . 107 



30. MALE SPIDERS FIGHTING .... 108 



31. MALE ARGUS PHEASANT DISPLAYING HIMSELF . 109 



32. GREAT CRESTED GREBE, COURTSHIP OF . . Ill 



33. MALE OF Kurtus gulliveri . . . .116 



34. SEA-HORSE, HIPPOCAMPUS .... 117 



35. BROOD-SAC OF MALE RHINODERMA . . . 119 



36. NEST OF TAILOR-BIRD ..... 121 



37. NEST OF TRAPDOOR SPIDER .... 131 



38. NEST OF HOUSE-MARTIN .... 132 



39. FLIGHT OF HERON ...... 133 



40. GOSSAMER ....... 134 



41. WING OF BIRD ...... 136 



42. DIAGRAM OF NERVE-CELL .... 140 



43. BRAIN OF PIGEON ...... 142 



44. BRAIN OF DOG ...... 143 



45. SMOOTH MUSCLE ...... 145 



46. SHEEP'S STOMACH ...... 148 



47. BEHAVIOUR OF PARAMECIUM . . . .160 



48. STENTOR ....... 161 



49. HEN PROTECTING BROOD .... 163 



50. YOUNG DUCKS CATCHING MOTHS . . . 166 



51. CILIATED EPITHELIAL CELL .... 198 



52. STRUCTURE OF A CELL ..... 199 



53. ANIMAL CELL ...... 200 



54. CELL-DIVISION ...... 203 



55. INTERCELLULAR BRIDGES .... 204 



56. THREE KINDS OF WINGS .... 208 



57. BONES OF WINGS ...... 209 



58. SKULL OF LION ...... 214 



59. SKELETON OF DUCK 216 



