XX CONTENTS. 



Page 



Chapter V. — Insects 265 



§ 1 . Aptera 265 



2. Insecta alata 268 



3. Developement of Insects 270 



4. Aquatic Larvae 277 



5. Terrestrial Larvae 278 



6. Imago, or perfect Insect 283 



7. Aquatic Insects 299 



8. Progressive motion of Insects on land 302 



9. Flight of Insects 308 



Chapter VI. — Vertebuata 322 



§ 1. Vertebrated Animals in general 322 



2. Structure and Composition of the Osseous Fabric 326 



3. Formation and Developement of Bone 335 



4. Skeleton of the Vertebrata 345 



Chapter VII. — Fishes 363 



Chapter VIII. — Reptilia 387 



§ 1. Terrestrial Vertebrata in general 387 



2. Batrachia 388 



3. Ophidia 398 



4. Sauria 406 



5. Chelonia 411 



Chapter IX. — Mammalia 423 



§ ] . Mammalia in general 423 



2. Cetacea 427 



3. Amphibia 43 1 



4. Mammiferous Quadrupeds in general 432 



5. Ruminantia 442 



6. Solipeda 456 



7. Pachydermata 458 



8. Rodentia 462 



9. Insectivora 464 



10. Carni vora 467 



1 1 . Quadrumana 470 



12. Man 473 



Chapter X. — Vertebrata capable of flying 481 



^ 1. Vertebrata without feathers, formed for flying .... 481 



2. Birds 489 



