228 



INDEX 



Nautilus, chambered, 107. 



Xectar, 8. 



Nephridium, 45. 



Nervous system, of bee, 78; of 



mussel, 102. 

 Nest building, 166, 182. 

 Neuroptera, 82. 



Nostril, of bird, 151; of fish, 112. 

 Nucleolus, 6. 

 Nucleus, 6, 11, 14. 



Octopus, 106. 

 Okapi, 214. 

 Omnivorous, 47. 

 One-celled animals, 7. 

 Opossum, 197. 

 Oral surface, 35. 

 Orang, 227. 

 Order, 9. 

 Organ, 1. 

 Organism, 1. 

 Orthoptera, 82. 

 Osculum, 18. 

 Ovary, 25, 37, 117. 

 Oviduct, 46. 

 Oxidation, 3, 4, 5. 

 Oxygen, 4, 5. 

 Oyster, 104. 



Paramecium, 13. 



Parasites, 49, 93. 

 Partridge, 178. 

 Pearls, 105. 

 Peccary, 217. 

 Perch, 109, 110, 123. 

 Pests, insect, 93. 

 Pheasant, 174. 

 Plastron, 141. 

 Pollen, 85. 

 Pollen basket, 88. 

 Polyp, 9, 22, 125. 

 Portuguese man-o'-war, 28. 



Potato bug, 90. 



Primates, 220. 



Proboscis, of butterfly, 83, 87; 



elephant, 207. 

 Prolegs, 84, 87. 

 Protection of birds, 171. 

 Protective resemblance, 34, 146. 

 Protoplasm, 6, 11. 

 Protozoa, 7, 9, 11, 125. 

 Pseudoneuroptera, 82. 

 Pseudopod, 11. 



Quill, 156. 



Rabbit, 205, 223. 



Radial symmetry, 34, 125. 



Rattlesnake, 145. 



Rectum, 134. 



Regeneration of lost parts, 37. 



Reproduction, 12, 15, 20, 25, 37, 



46, 120. 

 Reptiles, 139. 

 Rhizopoda, 16. 

 Road runner, 169. 

 Robin, 183. 

 Rotifer, 49. 

 Round worm, 49. 

 Ruminant, 213. 



Salamander, 134, 138, 139. 



Sandworm, 49. 



San Jose scale, 95. 



Scab in sheep, 95. 



Scales, of bird, 161 ; fish, 110: 



moth, 89. 

 Scallops, 104. 

 Scarab, 90, 91. 

 Sea anemone, 33. 

 Sea fan, 32. 

 Sea horse, 124. 

 Sea urchin, 38. 

 Senses of insects, 76. 



