INDEX 



References are to pages 



Alligators, classified .... 7 



described 133 



example of reptiles .... 129 

 Alternate leaves, of beech 



family 327 



of nightshade family .... 331 



of parsley family 329 



of pulse family 329 



of rose family 328 



of walnut family 327 



Alternation of generations, 



in coelenterates 68 



in ferns 372 



in mosses 366 



Althaea, member of mallow 



family 329 



Altricial birds, defined . . . 142 



nest of yellow warbler (fig.) . 142 

 American elm, scientific name 



of ^ . . 7 



Ammonia in test for protein 265 

 Ammonium tartrate in Pas- 

 teur solution 356 



Amoeba, classified 6 



described 47 



diagram of (fig.) 48 



microphotograph of (fig.) . . 47 



reproducing by fission (fig.) . 49 



reproduction of 3 



respiration of 49 



Amphibians, described ... 113 



economic importance of . . . 127 



example of 7 



laboratory study of .... 113 



number of 7 



summary of 127 



Amphioxus, notochord of . . 104 



Anatomy of starfish (fig.) . . 72 



Anesthetic, defined .... 221 



dissolves lipoid 223 



Angiosperms, classes of . . . 7 



defined 7 



Animal biology 11 



Animal cell (fig.) 4 



Animal parasites, habits of . 233 



Animal starch, in liver . . . 174 

 Animals, agents in distribution 



of seeds 313 



decomposed by bacteria . . . 345 



without a backbone .... 6 



Annelida, a class of worms . . 76 

 Annual rings, age of tree told 



by 377 



in longitudinal sections of 



trunks 291 



in stem of pine 377 



Anopheles, mosquito (fig.) . . 42 



cause of malaria . . . .42, 238 



Antennae of grasshopper . . 14 

 Anterior adductor muscle of 



clam 95 



Antheridia of fern 371 



of moss 365 



Antheridial plant of mar- 



chantia (fig.) 365 



Anthers, described 296 



Anti-pain medicines .... 246 



Antitoxin, defined 351 



described 252 



in preventing spread of disease 246 



use of in diphtheria .... 253 

 Ants, example of complete met- 

 amorphosis 19 



social life of 41 



Anus, in digestive system of man 169 



Aorta, largest artery in man . 202 



Aortic arches of earth-worm 82 



Aphis, woolly (fig.) 25 



Apiary, escape of bees from . . 35 



model (fig.) 38 



Appendicitis 168 



Appendix, vermiform .... 168 



X-ray photograph of (fig.) . . 169 

 Appetite, guide to amount of 



food 180 



Apples, a form of fruit . . . 310 



example of pome (fig.) . 309, 310 



produced by rose family . . . 329 



value of as food 178 



Aqueous humor 216 



Arachnids, list of 91 



Arbor vitae, cones of (fig.) . . 378 



Arch, of foot 187 



of hypocotyl of bean .... 264 



Archegonia, of fern .... 371 



of moss 365 



Archegonial plant of mar- 



chantia (fig.) 365 



Arctic regions, adaptations for 161 



plants of 396 



