INDEX 



(References to illustrations are indicated by asterisks accompanying page num- 

 bers. When an asterisk precedes the citation of a group of pages, it means that 

 several illustrations are included) 



Absorption of carbon dioxide, 13, 14 



Absorption of water by roots, 9, 

 23-25 



Accessory buds, 95*, 96* 



Acer saccharum, 309, 310* 



Actinomorphic, 129 



Adventitious buds, 96, 98* 



Aerial roots, 30*, 31*, 73* 



Agriculture, 197, 308-332. See also 

 topics such as Plant Breeding, 172- 

 193 ; Fungous Diseases of Plants, 

 234-261 ; and Weeds, 333-342 



Air, relation to germination, 161 



Air chamber, 36* 



Air passages, 85* 



Air plants, 31, 48, 49*, 50 



Air roots, 30*, 31, 73* 



Air supply of roots, 26*, 27, 28, 321 



Akene, 167*, 304 



Albuminous substances. See Proteins 



Alfalfa, nitrogen production by, 205 



Algae-fungi, *235-242, 261 



Algae, *219-233 



Algae, classification of, 260, 261 



Algae, and water supply, 229, 230 



Alternate branches, 96* 



Alternate leaves, 70*, 71 



Alternation of generations, 266 



Amanita, 258* 



Ament. See Catkin 



Anchorage, 8*, 9, 25 



Angiosperm, life history of, *208~304 



Angiosperm flower, 14*, 15*, *125- 

 154, *298-302 



Angiosperms, 282, *296-307 



Animal food, plant sources of, 7, 40, 

 47 



Annual ring, 12*, 65*, 66 



Annual thickening, 12*, 65*, 66, 67 



Annuals, 12, 44 



Anther, 128*, 129* 



Antheridium, 264, 265*, 269*, 275* 



Anthrax, 203 



Antipodal cells, 136*, 301* 



Antitoxins, 212, 213 



Apetalous, 127* 



Apple, branch arrangement of, 96* 



Apple, leaf arrangement of, 70* 



Apples, 191*, 315-319 



Aquatic plants, 78*, 79*, 85*, 219 



Arbor vitae, 293* 



Archegonium, 264, *265, *269, *275 



Aristolochia stem, cross section of, 



62*, 63 



Arrangement of leaves, *70~73 

 Arum, pollination of, 147*, 148 

 Ascocarp, 244*, 245 

 Ascomycetes, *243-247, 261 

 Ascophyllum, 230 

 Ascospores, 244*, 245 

 Ascus, 244* 



Asexual reproduction, 225 

 Asparagus rust, 254 

 Assimilation, 46 

 Atrichum, 263*, 265* 

 Axillary bud, 95*, 96* 



Bacteria, 39, *1 99-2 18 

 Bacteria, classification of, 260 

 Bacteriology, 197 

 Bark, 10, 11, 12*, 20, 65*, 105* 

 Basidiomycetes, *251-260 

 Bast, hard, 20, 62*, 64* 

 Bast, soft (sieve tubes), 20*, 43, 63* 

 Bean seed, 158* 

 Beefwood, 56* 

 Bees, 146*, 150* 

 Berries, 157 

 Biennial, 12, 44, 73, 74 

 Big tree, 287*, 294, 296 

 Bilaterally symmetrical flowers, 128*, 

 129 



359 



