198 



PLANT GROWTH 



Corn, 7 



Corolla, 116 



Corymb, 113 



Cotyledon, 7, 8, 12, 13, PI. I 



Cowpeas, 168, PI. XII 



Crabgrass, 106, 107, 109, 110 



Crocus, 189 



Crossing over, 135, 136, 143 



Cross-pollination, 116, 119, 120, 121 



Cultivation, 158, 160 



Cutin, 98 



Cuttings, 156 



Cytology, 150 



Cytoplasm, 23-25 



D 



Dandelion, 110, 118 



Date, 121 



Datura, 191 



Day, length, 84, 85 



DDT, 101 



DeVries, 130 



Dicotyledon, 10, 53, PI. I 



Diffusion, 41, 48, 50, 79, 87 



Disc flower, 113, 118 



Diseases, 97-103 

 control of, 101-103 

 infected leaf, 99, 100 

 tobacco mosaic virus, 122 



Dock, 105 



Dominance, 125 



Dominant characters, 125 



Dormancy, 186, 188-192 - 



Drainage, 160 



Earthworm, 159 



Ecology, 1 



Elements, 164-170, 173 



boron, 164, 165, 168, 169 



calcium, 43, 159, 164-166, 169, 171, 172 



carbon, 164, 165, 175 



copper, 164, 165, 169 



deficiencies, 169 



essential, 164, 165, 169 



hydrogen, 164 



iron, 164, 169, 173 



magnesium, 164, 166, 169, 171 



manganese, 164, 165, 169 



nitrogen, 164-170, 173, 175-180 



oxygen, 164, 179, 186 



phosphorus, 164, 166, 168-172 



potassium, 159, 164-170 



selenium, 43, 98, 164 



sulphur, 164, 169 



zinc, 164, 165, 168, 169 

 Embryo, parts of, 7, 9, 10 

 Endosperm, 7, 10, 119 

 Energy, 79 

 Environment, 47 

 Enzyme action, 17, 100 

 Enzymes, 119, 151, 152, 190 

 Epidermis, 72-74 

 Epithelium, 10 

 Erosion, 161, 162 

 Evaporation, 87, 88 



Fats, 80 

 Ferns, 171 



Fertilization, 8, 117, 119 

 Fertilizers, 42, 109, 110, 164-174, 177, PI 

 VI 



insoluble, 47 



lime, 159 



soluble, 47 

 Field capacity, 50, 91 

 Flowers, 112-121 



anther, 113-115, 116 



calyx, 115 



carpel, 116 



clover, 117 



complete, 115 



composite, 118 



corolla, 116 



corymb, 113 



dandelion, 118 



defined, 112 



disc, 113 



egg cell, 117, 119 



embryo, 119 



embryo sac, 119 



endosperm, 119 



fertilization, 117 



filament, 114, 117 



fruit, 120, 121 



glume, 118 



grass, 117, 118 



