GENERAL INDEX. 



297 



Nyctitropic curvatures, 264 

 movements, 273 



Oedogonium, 193 

 Oil-glands, 154 

 Oogonium, 189 

 Oomycetes. 194 

 Oospore, 188 

 Open bundles, 82 

 Organic acids, 140 

 Organs of plants, 155, 244 

 Origin of species, 244 

 Ortiiostichy, 179 

 Ortbotropic, 275 

 Ortbotropous, 228 

 Osmosis, 106 

 Ovary, 212, 228 

 Ovule, 227 

 Oxygen, 253 



Palisade-cells, 123 

 Panicle, 182 

 Parasites, 143 

 Parastichy, 178 

 Parenchyma, 41 

 Parietal placentation, 228 

 Parmelia, 146 

 Passive growth, 261 

 Peduncle, 163 

 Peloric flowers, 219 

 Perennial plants, 158 

 Perianth, 215 

 Periblem, 49 

 Pericambium, 60 

 Pericarp, 232 

 Periuiuin, 196 

 Perigynous, 217 

 Perisperm, 230 

 Peristome, 202 

 Permanence, 244 

 Petiole, 160 

 Pbelloderm, 57 

 Phellogen, 56 

 Phloem, 75 

 Pbloim-bundle, 75 

 Pbospborus, 254 

 Pbototonous, 273 

 Pbylloclades, 160 

 Pbyllodes, 160 

 Pbyllome, 157, 159 

 Pbyllotaxy, 171, 175 

 Pbylogeny, 245 

 Physiology, 1, 2, 252, 258 

 Pinnae, 161 

 Pinnulse, 161 

 Pitted vessels, 35 

 Placenta, 212 

 Plagiotropic, 275 

 Plane of symmetry, 219 

 Plant-diseases, 197 

 Plasm, 4 



Plasmic movement, 277 

 Plasmic utricle, 4-6 

 Plasmolysis, 7-9 



Pleon, 267 

 Plerome, 49 

 Pleurotropous, 229 

 Polioplasm, 6 

 Pollen-grain, 211, 223 

 Pollen -sac, 223 

 Pollen-tube, 204, 212 

 Pollination, 238 

 Pollinium, 227 

 Polycarpous, 158 

 Polymerous, 228 

 Pore, 36 

 Pore-canal, 37 

 Pore-membrane, 38 

 Porous thickenings, 34, 36 

 Potassium 253 

 Primary cortex, 91 

 Primary membrane, 41 

 Primary vessels, 35 

 Primordia, 219 

 Primordial utricle, 5, 7 

 Proniyceliurn, 198 

 Pro-nucleus, 241 

 Prosencbyma, 41 

 Protaudry, 239 

 Proteids, 99 

 Protballium, 202 

 Protococcus, 193 

 Protogynous, 239 

 Proton ema, 194 

 Protoplasm, 4 

 Pseudaxis, 180 

 Pseudo-parenchyma, 199 

 Pucciuia, 197 

 Pyreuoids, 15 



Raceme, 182 



Racemose infloresence, 182 



Radial structure, 166 



Rank, 183 



Raphe, 229 



Receptacle, 216, 231 



Reciprocal hydrids, 241 



Rectipetality, 280 



Reproduction, 185 



Reserve materials, 150 



Reservoirs for reserve materials, 142 



Resin, 152, 256 



Resin-ducts, 153 



Respiration, 256 



Rest period, 237 



Resupiuatiou, 220 



Retardation of growth by light, 273 



Reversion, 242 



Rbeotropism, 276 



Rhexigenous, 154 



Rbizoids, 140 



Rhizome, 157 



Root, 157 



Root- cup, 47, 116 



Root- hairs, 139 



Root- pressure, 107 



Roots, 139 



Root-sheath, 112 



