INDEX 



PAGE 



Abdomen 17 



Aberrancies of regeneration 358 



Acarina 43 



Accessory chromosome. . . 301 



Acorns 5 



Active or motor organs ... 436 



Adaptation 287, 459 



Adaptation in the indivi- 

 dual 457 



Adaptations of flowers ... 1 1 

 Adaptations of insects .... 17 



Adaptive radiation 239 



Adjustment 14, 368 



Adjustment in form and 



appearance 404 



Aeschna 427 



Aestivation 376 



Age of Stone 494 



Agassiz 224 



Air-swallowing 182 



Ajax butterfly 308 



Alaus 429 



Albinism 316 



Alcohol 94 



Algae 56, 105, 1 19, 334 



Alimentary canal .164, 186, 197 



Alternation of hosts 340 



Allantoic artery 215 



Allantoic vein 215 



Allantois 215 



Alternation of generations 



124,330 



Alternative inheritance ... 310 



Altricial birds 323 



Amblyopsidae 288 



Ambystoma 179, 257 



Amoeba 68, 437 



Ammophila 490 



Amnion 215 



Amphibian 214 



Anabolism 90 



Analogy 224 



Anaphase 294 



Anax junius 413 



Angiosperms 152 



PAGE 



Animal coloration 422 



Animal galls 38 



Animal series 156 



Animism 502 



Annual rings 147 



Annulus 135 



Antennae 17 



Antennal hairs 447 



Antennaria 359 



Anterior abdominal vein . . 188 



Anther 9 



Antheridium 122 



Antler 365 



Antipodal nuclei 153 



Antiseptics 98 



Ants 10, 48 



Ant sheds 50 



Aortic arches 165 



Apes 485 



Aphids 3 8 47, 306 



Aphidae 43 



Aphid eggs 52 



Aphid gall 38 



Apocynum 366 



Appendages- 181, 231 



Apposition 114 



Aquatic insects 407 



Archaeology 493 



Archaeopteryx 248 



Archegonial disc 123 



Archegoniophore 122 



Archegonium 122,129 



Arch-enteron 171, 197 



Arcs 465 



Aristotle ^ 470 



Artificial fertilization .... 304 



Artificial division. ........ 353 



Artificial selection 279 



Artisan stage 496 



Asellus . 233 



Ascomycetes . 96 



Asexual reproduction .... 331 



Asexual reproductive cells 333 



Asparagin 85 



Assimilation 329 



