260 



INDEX 



Photosynthesis, 46 

 Pistil, 54, 62 

 Placenta, 63 

 Plant breeding, 147 



diseases, 139 



foods, 111 



geography, 131 



hair, 103 



societies, 147 

 Plants, composition of, 105 



uses of, 183 

 Plum, 240 

 Plumule, 14 

 Pollen, 62, 123 

 Pollination, 75, 79, 80, 122 

 Polygonaceous, 222 

 Polypetalous, 60 

 Populous, 227 

 Potato, 219 



sweet, 218, 240 

 Proteins, 108, 116 

 Prothallus, 160, 164 

 Protonema, 164 

 Protoplasm, 93 

 Pteridophytes, 158 

 Pyrus, 205 



Quercus, 226 

 Quince, 240 

 Quinine, 215 



Raceme, 64 

 Radicle, 7, 12 

 Radish, 189, 234 

 Raphe, 7 



Rays, medullary, 99 

 Reproduction, 74 



of ferns, 160 

 Respiration, 51 

 Rheum, 222 

 Rhizome, 37 

 Rhizopus nigricans, 172 



Rhubarb, 222 



Ribs of leaves, 48 



Rice, 230 



Rings, annular, 32, 99, 100 



Roots, 4, 18, 20, 23-25, 27-30, 



101 



Root hair, 25, 26 

 Rosacese, 204 

 Rose, 204 

 Rootstock, 37 

 Rubiacese, 215 

 Rue, 195 

 Rutaceae, 195 



Saccharum, 232 



Saccharomyces, 172 



Salicacese, 227 



Salix, 227 



Saprolegnia, 173 



Sapwood, 100 



Saxifragacese, 211 



Saxifrage, 211 



Scales of buds, 51 



Scutellum, 11 



Secale, 230 



Seeds, 3, 4, 7, 75, 77, 78, 83, 88, 



89, 137, 239 

 Seedling, 3 

 Sepal, 54 

 Setaria, 230 

 Scieties of plants, 127 

 Soil, 128, 129 

 Solancese, 219 

 Solanum, 219 

 Sorghum, 232 

 Sori, 159 

 Spadix, 65 

 Sperms, 171 

 Sphagnales, 166 

 Spike, 65 

 Spinach, 222 

 Spirogyra, 94, 170 



