3o6 



INDEX. 



All references are to pages, Italic figures indicate illustrations. 



l68, 169; photeolic 182; proto- 

 plasm 164; spontaneous 168, 

 181; to reduce illumination 238; 

 turgor 179; water 247 



Mucor 19S, Mucedo 3S 



Mulberry flower 22^ 



Multiple fruits 223 



Mustard 173 



Mutualism 252 



Mycelium 32 ; of lichen 38 



Mycorhiza 254; of orchids Z55 



Myosurus minimus 208 



Nasturtium 106, 170 



Nepenthes villosa S6S 



Nettle $87 



Nitrogen supply 261 



Nodes 83, SU 



Nostoc 7 



Nucleus 3 



Nutation 168 



Nutrition 49, 124; of green plants 



138 

 Nymphasa, pollen grains of $05 



Oat, cell of 4; %T3.ia.2$0 



Offsets 77, 213 



Oil receptacle 151 



Oleaster, scales of Sj^l 



Oligotrichum aligerura 48 



Onion stem 89 



Opuntia vulgaris S40 



Orchid, chromoplast of 4; myco- 

 rhiza of $55; pollen mass oi$05; 

 seeds of $80 



Organ I 15 



Orthotrichum j^ 



Oscillaria 8 



Ovulary 200 



Ovules 197, 198, 200, $01 



Oxygen 162 



Palm stem 85 

 Pansy seed $19 

 Parasites 34, 138 

 Parasitism 257 

 Parmelia conspersa $57 

 Pea, root of 157; seedling 68; 

 shoot of 108 



Pear, Tpriddy $40 



Penicillium glaucum 191 



Peperomia trichocarpa $44 



Perianth 205 



Pericarp 219 



Periderm 66, 91 



Peronospora 38 



Petiole, scarlet runner 180 



Phascum cuspidatum SO 



Photosynthesis 140, 146; product 



of 141 

 Physiology 115 

 Phytolacca decandra $19 

 Pilobolus crystallinus $71 

 Pimpernell, capsule of $$$ 

 Pine, Scotch 78 

 Pistils $00; closed 198 ; simple and 



compound 199 

 Pitcher plant 107 

 Pith 27, 89; rays 93 

 Placenta 202 

 Plasmodia 1$0 

 Plastids 3 



Plectranthus, hairs of 86 

 Pleurococcus 11, 1$ 

 Pokeberry seed $19 

 Pollen 203, $04, 205 

 Pollination 207, 275 ; of eel grass 



$74 

 Polygonatum, leaf of 105 

 Polygonum, stipules of 10$; vivi- 



parum 80 

 Polypodium vulgare 54 

 Polyporus 33 

 Polysiphonia 24 

 Polytrichum commune 47 

 Pond weed $13 

 Poplar, white $54 

 Poppy, California $71 

 Porella platyphylla 46 

 Potamogeton crispus $13 

 Potassium, salts 141 

 Potato $16; cell of 4; pistil of 



white 200 

 Precipitation 234 

 Protection 233, 266; of spores and 



seeds 270 

 Proteids 142 

 Protococcus $57 

 Protonema 49 



