X CONTENTS. 



intestines of animals, 237 ; valves or plates, ib. -, lengtli, 

 238 ; V. bones of animals, 239 ; bones of birds, ib. ; vi, 

 lungs of animals, 240 ; lungs of birds, ib.] vii. birds ovipa- 

 rous, ib.] viii. instruments of motion, 241 ; wings of birds, 

 ib. ] fins of fish, 243 ; web-feet of water-fowl, 247 } ix. 

 senses of animals, 248. 



J^Tote 50, on the coverings of birds and other animals with refer- 

 ence to warmth, 228 5 51, on the adaptation of the bills of 

 birds to the habits of each kind, 232; 52, on the connexion 

 of the fifth nerve of the brain with the organ of touch, 235 ; 

 53, referring to the Appendix for observations on the rela- 

 tion of the bodies of birds to the atmosphere, 240 ; 54, on 

 the necessity of birds being oviparous in order to retain the 

 power of flying, 241 ; 55, on the similarity of the system of 

 bones in all vertebrated animals, 243 ; 56, on the uses and 

 muscular power of the fins of fishes, 246. 



CHAPTER XIII. 



PECULIAR ORGANIZATIONS. 



Pax- wax of quadrupeds, 252 ; oil of birds, 254; air-bladder of 

 fish, z6. ; fang of viper, 257 ; bag of opossum, 258; claw 

 of heron, 259; stomach of camel, 260; tongue of wood- 

 pecker, 261 J babyroussa, 265. 



JVote 57, on the ligaments of the neck, 253 ; 58, on the air-bladder 

 of fishes, 256 ; 59, on the habits and tongue of the wood- 

 pecker, 262 ; 60, on the erroneous notion of the babyroussa 

 sleeping standing, 266. 



CHAPTER XIV. 



PROSPECTIVE CONTRIVANCES. 



Teeth, 267; milk, 270; eye of the foetus, 272; lungs of the 

 foetus — foramen ovale, &c., 275. 



