INDEX. 



ACANTHOCEPHALA, 310 



Acarus scabei, 321 

 Accessory idioplasm, 238 

 Acquired immunity, 343 

 Actinozoa, 309 



Adami's theory of heredity, 247 

 Aerobic bacteria, 52 

 African lethargy, 331 

 Agassiz on classification, 280 

 Aggressins, 334, 337 

 Alexine, 357 

 Allelomorphs, 244 

 Allman on geotropism, 66 

 Alternation of generation, 183 

 Amboceptor, 349 

 Amnion, 208 



Amoeba and electric currents, 

 61 



conductivity in, 69 



food reactions of, 49 



mechanical stimulation, 44 



movement in, 74 



structure of, 108 

 Amoeboid movement, 74 

 Amphiaster, 104 

 Amphimixis, 114, 179 

 Amphipyrenin, 97 

 Anaphylaxis, 347 

 Anaximander, 21 

 Anchylostoma, 324 



duodenale, 310 

 Ancistrum, 308 



Anesthetics, 37 



Animal cells, composition of, 85 



kingdom, relations of divi- 

 sions of, 277 

 Animalculists, 194 

 Animals, classification of, 284 



conductivity in, 70 



geotropism in, 66 



reproduction in, 186 

 Annulata, 311 

 Anopheles, 328 

 Anophlophyra, 308 

 Antheridium, 176, 185 

 Anthers, 185 



Anthrax, vaccine for, 365 

 Antibodies, 346 

 Antigen, 289, 346 

 Antitoxins, therapeutic, 348 

 Apanteles congregatus, 316 

 Arachnida, 317 

 Archegonia, 185 

 Archenteron, 203 

 Archiblast, 203 

 Archicele, 203 

 Aristotle, 255, 273 

 Arnold, 105 

 Arthropoda, 311 

 Ascaris lumbricoides, 310, 324 

 Ascogonium, 173 

 Ascus, 174 



Asexual reproduction, 167 

 Asphyxia, 54 



427 



