INDEX. 



Abdomen of insects, i. 324. 

 Aberration, chromatic, ii. 474. 

 Aberration of parallax, ii. 459, 



472. 

 Aberration, spherical, ii. 458, 



471. 

 Absorption,vegetable,ii. 19,22. 

 Absorption, animal, ii. 12,351. 

 Absorption, lacteal, ii. 226. 

 Absorption of shell, i. 239. 

 Acalepha, i. 192; ii. 293. 

 Acarus, i. 297. 

 Achatina zebra, i. 242. 

 Achromatic power, ii. 475. 

 Acephala, i. 217; ii. 116, 300. 

 Acetabulum, i. 405. 

 Acid secretions, il. 46. 

 Acrida, ii. 214. 

 Acridium, i, 333. 

 Acoustic principles, ii. 414. 

 Actinia, i. 182, 197; ii. 99, 



383, 477, 586, 592. 

 Adipose substance, i. 123. 

 Adductor muscle, i. 218. 

 Aeration of sap, ii. 29. 

 Aeration, animal, ii. 34, 611. 

 ^schna, i. 351. 

 Affinities, organic, ii. 7. 

 Agastric medusae, ii. 92. 

 Age of trees, i. 85. 

 Age, effects of, ii. 620. 

 Agouti, i. 498. 

 Agrion, ii. 240. 



Air-bladder, i. 429. 

 Air cells of plants, i. 76. 

 Air cells of birds, ii. 329. 

 Air, rarefaction of, in birds, i. 



557. 

 Air tubes in plants, i. 73. 

 Albumen, i. 105. 

 Alburnum, i. 85; ii. 41. 

 Algse, ii. 19. 



Alimentary canal, ii. 107. 

 Alimentary canal, formation of, 



ii. 610. 

 Alitrunk, i. 345. 

 Alligator, i. 458, 460 ; ii. 409. 

 Amble, i. 495. 

 Ambulacra, i. 201. 

 A7nici, i. 77 ; ii. 50. 

 Amphibia, i. 436, 487. 

 Amphisbsena, i. 447, 448. 

 Amphitrite, i. 281, 

 Anabas, ii. 306. 

 Analogy, law of, i. 49 ; ii. 625. 

 Anarrhichas, ii. 128. 

 Anchylosis, i. 382. 

 Ancillaria, i. 241. 

 Anemone, sea, i. 198. 

 Angler, i. 422; ii. 390. 

 Anguis, i. 447, 454. 

 Animal functions, i. 39. 

 Animal organization, i. 96. 

 Animalcules. See Infusoria. 

 Annelida, i. 269; ii. 249, 297. 



383, 479. 



