310 



INDEX. 



Skeleton, of insect, 38. 



of rabbit, 253. 



of sparrow, 227. 



of turtle, 203. 

 Skin, of fish, 161. 



of frog, 190. 



of insect, 38, 92. 



of rabbit, 239. 



of sparrow, 217. 



of turtle, 204. 



of worm, 136. 

 Skull, of fish, 171. 



of frog, 194. 



of rabbit, 255. 



of sparrow, 227. 

 Snail, 154. 

 Snake, 208. 

 Sparrow, 211. 

 Specialization, 21, 33. 

 Species, 102. 

 Sperms, 29, 137. 

 Spicules, 23, 280. 

 Spider, 105. 

 Spinal column, of fish, 169. 



of frog, 191. 



of rabbit, 253. 



of sparrow, 230. 



of turtle, 205. 



Spinal cord. See Nervous system. 

 Spiracle of insect, 42, 51. 

 Spleen, 168, 182, 224, 24(5. 

 Sponge, 22. 



gemmules, 23, 280, 281 

 Squash bug, 57. 

 Starfish, 266. 

 Sternum, of frog, 192. 



of rabbit, 254. 



of sparrow, 232. 



Stomach. See Digestive organs. 

 Stylets, 125. 

 Swimmer, 115. 

 Syrinx, 222. 



Tarsus. See Foot. 

 Teasing, 283. 

 Teeth. See Mouth. 

 Telson, 114. 



Test of strength of beetle, 79. 

 Tetraopes, 78. 

 Thoracic duct, 250. 

 Thorax, of insects, 40. 



of rabbit, 243. 

 Thousand-legs, 110. 

 Thymus, 250. 

 Tissue, 32. 



Tongue. See Mouth. 

 Trachea. See Respiratory organs 

 Tracheal gills, 47, 94. 

 Tracheal tube, 53, 94. 

 Turtle, 198. 



Ulna. See Arm bones. 

 Umbo, 141. 

 Unio, 140. 



Uterus, 262. 



Vacuole (vesicle?), 15, 20 

 Vegetative reproduction, 27. 

 Veins, of fish, 163, 168. 



of frog, 183. 



of mussel, 146. 



of rabbit, 246. 



of sparrow, 226. 



of turtle, 202. 



Vermiform appendage, 246. 

 Vertebra. See Spinal column. 

 Voluntary motion, in amoeba, 17. 



in hydra, 31. 



in insect, 97. 



in mussel, 152. 



in vertebrates, 262. 



Water- vascular system, 270. 

 Wing, 213, 216. 

 Wing bones, 233. 

 Worm, 130. 



