INDEX. 



Abdomen of insects, i. '290 

 Abdomen of" spiders, i. 254 

 Aberration, chromatic, ii. 4?4 

 Aberration, parallactic, ii. 421 

 Aberration, spherical, ii. 4 1 0, 420 

 Absorption, ii. 1 1 

 Absorption, animal, ii. 316 

 Absorption, lacteal, ii. 200 

 Absorption, vegetable, ii. 16 

 Acalepha, i. 175, 195, 266, 360 ; 



ii. 104, 240, 266, 272 

 Acetabulum, i. 252 

 Achatina, i. 216, 217 

 Achias, ii. 436 



Achromatic combinations, ii. 424 

 Acid secretions, ii. 39 

 Acoustic principles, ii. 370 

 Acrida, ii. 187 

 Acridium, ii. 298 

 Acromion, i. 359 

 Actinia, i. 165,179; ii. 88, 343, 



426, 485, 531 

 Adanson, i. 226 

 Adductor muscle, i. 196 

 Adipose substance, i. 110 

 Aeration of sap, ii. 25, 29 

 Aeration, animal, ii. 29, 549 

 iEshna, i. 314 

 Afferent nerves, ii. 322, 478 

 Affinities, organic, i. 7 

 Affinity of structure, i. 323 

 Agaon, ii. 344 

 Agassiz, i. 385 

 Agastric medus-cje, ii. 64, 81 

 Age, progress of, ii. 558 

 Age of trees, i. 74 

 Agouti, i. 441 

 Agrion, i. 314; ii. 220 



Ailanthus, ii. 542 



Air-bladder, i. 382 ; ii, 279, 31 1 



Air-cells of birds, ii. 296 



Air, rarefaction of, in birds, i. 491 



Air-tubes of plants, i. 64 



Albumen, i. 91 ; ii. 6 



Alburnum, i. 74 ; ii. 33 



Algse, ii. 16 



Alimentary canal, formation of, 



ii. 547 

 Alitrunk, i. 289, 309 

 Alligator, i. 409 ; ii. 365 

 Alveus utriculosus, ii. 384 

 Amceba, i. 169 

 Amble, i. 438 

 Ambulacra, i. 183 

 Amici, i. 67 ; ii. 45 

 Amphibia, i. 388,431 

 Amphinoma, ii. 231 

 Amphisbasna, i. 399 

 Amphitrite, i. 251 

 Ampulla, ii. 383 

 Anabas, ii. 277 



Analogy, law of, i. 41 ; ii. 560 

 Analysis of bone, i. 329 

 Analysis, vegetable, ii. 36 

 Anarrhichas, ii. 115, 179 

 Anchylosis, i. 340 

 Ancillaria, i. 241 

 Anemone, sea. See Actinia 

 Angler, i. 376; ii. 349, 392 

 Anguis, i. 398, 399 

 Animal functions, i. 32; ii. 318 

 Animal magnetism, ii. 337 

 Animal organization, i. 82 

 Annelida, i. 242; ii. 204, 210. 



212, 229, 267, 269, 343, 428, 



487 



