456 VEGETABLE 
Micelle ot cell-wall, 43 
Micrococcus Urew, 255 
Microspores, 429 
Middle lamella, 45 
Mimosa, 62, 355, 357, 369, 371, 383, 
388 
Mimulus, 383 
Mistletoe, 199, 343 
Mitosis, 413 
Mrvosui on chemotaxis, 393 
Monoblepharis, 424 
Moneecious plants, 442 
Monotropa, 198 
Moorland plants, 338 
Movements, of protoplasm, 6, 348 ; 
for capture, 191, 193; of multi- 
cellular organs, 348 
Mucilage, 51, 234 
Mucor, 449 
Mycoderma aceti, 256 
Mycorhiza, 198 
Myriophyllum, 117 
Myronate of potash, see Sinigrin 
Myrosin, 248, 253 
Myxomycetes, 49, 346, 391, 392, 393 
Nazcent, theory of composition of 
cell-wall, 43 
Nectar, 272 
Nectary, 62, 440 
Negative pressure, in wood-vessels, 
89, 91; influence of, on move- 
ments of gases, 116 
Neottia, 185 
Nepenthes, 135, 190, 247 
Nervous mechanisms, 397 
Nickel, 175 
Nicotiana, 373 
Nitella, 6, 350 
Nitrates, 129, 160 
Nitrification, 134, 158 
Nitrogen, absorption of, 113, 133; 
in proteins, 161; fixation of, by 
leguminous plants, 134, 165, 197, 
by Alge, 165 
Nostoc, 12, 195 
Nuclear spindle, 414 
Nuclein, 8, 175, 177 
Nucleolus, 8 
Nucleoplasm, 8 
Nucleus, 5; position in cell, 7; 
structure of, 8; definitive, 433; 
generative, 437 
Nutation, 315 
Nyctitropic movements, 325, 372, 
374, 376 
Nymphea, 108, 332 
PHYSIOLOGY 
CGdogonium, 427 
Oil, see Fat 
Oncidium, 239 
Oogonia, 424 
Oospheres, 423 
Oospore, 425 
Optically active compounds, 153 
Opuntia, 292, 296 
Ornithogalum, 239 
Orobanchacee, 342 
Orobanche, 202 
Orthocarbonic acid in photosyn- 
thesis, 154 
Osmosis, 55; in adult cells, 60; 
from veins of leaf, 74; influence 
of, on transpiration current, 100, 
102 
Ouvirandra, 332 
Ovule, 431 
Oxalic acid, 296 
Oxalidacee, 371 
Oxalis acetosella, 362 
Oxidases, 255, 259, 299, 300 
Oxidation, 299 
Oxygen, mode of absorption by 
plants, 15, 31, 115; influence of, 
on action of roots, 85; proof of 
absorption of, 287; relation of 
absorption of, to exhalation of 
carbon dioxide, 291; variation in 
amount of, as affecting respiration, 
297 
Peonia, 40 
Pangium, 168 
| Papain, 252 
Paraheliotropism, 362 
Parapectine, 42 
Parasites, 121, 340 
Parasitism, 185, 196, 200 
Paratonic influence of light, 359 
Parnassia, 441 
Parthenogenesis, 449 
Passiflora, 385, 398 
Pectase, 248, 251, 252 
Pectic acid, 42; relation to middle 
lamella, 46 
Pectine, 41 
Pectose, 41 
Pediastrum, 12 
Pelvetia, 18 
Pennisetum, 27, 29 
Pepsin, 248, 251, 252 
Peptone, 163 
Perception, 406 
\Periodicity of root-pressure, 87, 356 
' Perisperm, 434 
