578 
542*; as demonstrated in Wheat, 
552*. 
Meristem, 126, 204, 126*, 204* 
Meristematic tissue, 126, 126*; of 
buds, 204, 204*; of Grass stems, 
213, 214*; of root tip, 148, 144*. 
Mesophyll, 244; described, 246, 250* 
Mesophytie societies, 504; described, 
506. 
Metabolism, 116, 273; anabolic and 
catabolic, 273. 
Micro-organisms of the soil, 155. 
Micropyle, 39, 57, 38*, 57*. 
Microsphaera, 373. 
Microspore, 442, 441*; formation, 
461, 462*; mother cells, 461, 461*. 
Microsporangium, 442, 441*. 
Microsporophyll, 442, 441*. 
Microstrobilus, 446, 447*. 
Middlings, 65. 
Midrib, 245. 
Mildews, Downy, 355-360; Powdery, 
373-375. 
Milkweed, 83, 133, 83*. 
Mistletoe, 163. 
Mixed buds, 207. 
Moisture, given off in transpiration, 
260, 260*; of the soil, 217; re- 
quired for germination, 91. 
Molds, 155; Blue and Green, 375-377; 
True, 360-363; Water, 353-360. 
Monadelphous stamens, 15. 
Monocotyledons, embryo, 466, 467*; 
families, 495; origin, 471; seeds, 
66; seedling, 102*, 103*, 104*, 
105*; stems, 170; structure of 
stems, 187-192. 
Monoecious, 14. 
Moonworts, 435, 434*, 435*. 
Morchella esculenta, 365, 365*, 366*. 
Morels, 364, 365*. 
Moming Glory, cotyledons, 111; 
plumule, 109; stem, 168, 175, 
TG": 
Morphine, 283. 
Morphology, 2, 289. 
Mosaic, of leaves, 241, 241*. 
Mosses, 292, 405; described, 417-424. 
INDEX 
Mucorales, 360-363. 
Mullein, leaf, 266* 
Multiple fruits, 80, 80*. 
Multiplication of cells, 123, 125*. 
Musci, 405. 
Mushrooms, 352, 382, 384, 385*, 386*. 
Mustard, Black, 483, 483*; family, 
482. 
Mutant, 527. 
Mutation, 525, 528*; in Evening 
Primrose, 529. 
Mutation theory, 527; compared with 
Darwinism, 531. 
Mycelium, 352. 
Mycorhiza, 155, 155*. 
Myrstphyllum, 169. 
Myxobacteria, 350. 
Myxomycctes, 336; described, 336- 
341; economic importance, 339. 
Naked Ascus Fungi, 364, 377, 376*. 
Naked buds, 205. 
Nasturtiums, 241*. 
Natural history, 524, 
Natural selection, 517. 
Navicula viridis, 332*. 
Nectar, 133. 
Nectar glands, 133, 133*. 
Nectarine, 528, 561. 
Nemalion, 326, 326*. 
Nereocystis, 319. 
Nerves, 245. 
Net-veined leaves, 245, 244*. 
Nicotine, 283. 
Nidularia, 392, 392*. 
Nightshade family, 491. 
Nitrogen, 133. 
Nodes, 166. 
Nostoc, 209, 208*. 
Nucellus, 38, 448, 454, 35*, 36*, 38*, 
449*, 455*. 
Nuclear membrane, 114, 114*. 
Nuclear sap, 114, 114*. 
Nucleolus, 114, 114*. 
Nucleo-proteins, 281. 
Nucleus, 39; described, 114, 114*; 
endosperm, 40, 44, 51; of leaf 
cell, 251, 251*; primary en- 
