XU CONTENTS. 



ib. ; organs of speech — voice and respiration to air, 308 ; 

 eye to light, ib. ; size of animals to external things, 309 ; of 

 the inhabitants of the earth and sea to their elements, 310 ; 

 sleep to night, 312. 



JVote 71, referring to the Appendix for observations on the bones 

 of large animals, 309 ; 72, on the succession of day and 

 night and on the changes of the seasons, with reference to 

 the happiness of animals, 313. 



CHAPTER XVIII. 



INSTINCTS. 



Incubation of eggs, 316 ; deposition of eggs of insects, 322 ; solu- 

 tion from sensations considered, 327. 



J^Tote 73, on the unchangeableness of animal instincts, 317; 74, 

 on the instincts of the chicken in breaking the shell of its 

 egg, 319; 75, on the natural and instinctive feeUngs of 

 man, 327 ; 76, on the arguments of skeptics, and on com- 

 pensations in animal organs and powers, 331. 



CHAPTER XIX. 



OF INSECTS. 



Elytra of the scarabseus, 337 ; borer of flies, 339 ; sting, 341 ; 

 proboscis, 343 ; metamorphosis of insects, 346 ; care of 

 eggs, 349 ; observations limited to particular species, 350 ; 

 thread of silk-worm and spider, ib. -, wax and honey of bee, 

 352 ; sting of bee, 355 ; forceps of the panorpa tribe, ib. ; 

 brushes of flies, ib.; glow-worm, 356 ; motion of the larva 

 of the dragon-fly, 357 ; gossamer spider, 358; shell animals, 

 359; snail shells, 360; univalve shell-fish, 361; bivalve, 

 363 ; lobster shell, ib. ; variety of insects, 364. 



J^ote 77, on the antennae of insects, 336 ; 78, on the word 

 coleoptera, 338 ; 79, on the wing-cases of brachelytra, ib. ; 

 80, on the wing-cases of the genera molorchus, ib.; 81, on 



