Index 



557 



Morels, 413. 



Morning-glory, root of, 198. 

 Mosaic disease, 435. 

 Mosaics, leaf, 65. 

 Mosses, 465, 471. 

 Moth mullein, 145. 

 Motile leaves, 68. 

 Movement of materials, 160. 

 Mucilage, 57, 78, 162. 

 Multiplication, vegetative, 225. 

 Mushrooms, 403, 421. 

 Mustard family, 534- 

 Mutation, 283; bud, 285. 

 Mycorhiza, 188. 

 Myxophyceae, 441. 



Natural selection, 551. 

 Nectar, 244. 

 Nitrifying bacteria, 396. 

 Nitrogen, uses of, 44. 

 Nitrogen cycle, 399. 

 Nitrogen-fixing bacteria, 396. 

 Nodes, 62, 116. 

 Nodxiles, root, 188, 398. 

 Nucleus, 17. 



Oak wood, 154, 156. 



Oaks, 438. 



Oats, 199. 



(Edogonium, 452. 



Oils, 41. 



Orchid, 240. 



Orchid family, 532. 



Organ, 21; essential, 58. 



Osmosis, 85. 



Osmotic pressure, 87. 



Ovulary, 238, 239, 241. 



Ovule, development of, 248. 



Oxidation, 48. 



Oxygen and bacteria, 387. 



Paleozoic forests, 499. 



Palm, bottle, 153; coconut, 371; date, iii 



family, 528; fan, 234; stem, 138. 

 Panicle, 232, 236. 

 Panicum stem, 135. 

 Paper pulp, 345, 354> 364- 

 Parasites, 380. 

 Parenchyma, 128. 

 Parmelia, 414. 

 Pasteurization, 393. 

 Peanut, 356. 



Pectic compounds, 56, 254. 

 Pedicel, 235. 



Peduncle, 235. 



Perennials, 145. 



Perigynous, 239. 



Perisperm, 250. 



Permeability, 86. 



Persimmon, 256. 



Pcziza, 412. 



PhcBOphycecB, 457- 



Phloem (food-conducting and bast tissues), 



134- 



Phosphorus, 219. 



Photosynthesis, 32 ; amount of product, 37 ; 

 and quaUty of light, 209; contrasted with 

 respiration, 49; hindrances to, 38; im- 

 portance of, 40 ; summary of, 40. 



Phycomycetes, 406. 



Pigments, 52; green, 52; red, 54; yellow, 

 52, 55, 56. 



Pine, Japanese dwarf, 145 ; life history of, 

 510; wood of, 154. 



Pineapple, 254; family, 531. 



Pine-blister rust, 419, 421. 



Pinesap, 382. 



Pinon, 336, 365. 



Pitcher-plant family, 534. 



Pith, 134, 138; rays, 132. 



Placenta, 239. 



Plains, grassland, 328. 



Plankton, 454. 



Plant, associations, 305; breeding, 272, 

 344; breeding and evolution, 549; dis- 

 eases, 423 ; distribution, 302 ; formations, 

 306; industries, 340; pathology, 430; 

 realms, 308. 



Plant industries, 340; of deciduous forest 

 region, 347 ; of desert region, 368 ; . of 

 northern conifer forest region, 345 ; of 

 plains region, 359; of prairie region, 357; 

 of southern conifer forest region, 353 ; of 

 tundra, 345; of western conifer forest 

 region, 360. 



Plants, classification of, 437 ; desert, 79, 

 168-173; floating, 79, 173; products of, 

 3; submerged, 79, 95, 173, 186. 



Plastids, 18. 



Plums, 275. 



Plumule, 257. 



Pollen, 241, 243; germination of, 244, 247; 

 tube, 244, 245. 



Pollination, 243; cross, 245; self, 245. 



Pome, 253. 



Pond scums, 448. 



Potamogeton, 174. 



Potassium, 216, 218. 



