INDEX 
Polygala Senega, 549, 550 
Polygalacea, 548 
Polygonacea, 246, 314, 512 
Polygonales, 512 
_ Polygonum, 512 
Bistorta, 513 
Polypeptides, 93 
Polypetala, 499 
Polyploidy, 658 
Polypodiacee, 435 
Polypodium, 434, 435 
Polyporacea, 404 
Polyporus officinalis, 404 
Polystichum, 435 
Polytrichum commune, Fig. of, 427 
life history of, 426 
Pome, 305 
of apple, Fig. of, 306 
Pomegranate Family, 570 
Ponteria, 582 
Poplar, 500 
Poppy, calyx of, 267, 268 
Family, 524 i 
fruit of, 299, 302° 
leaf of, 232 
Populi Gemma, 500 
Populus balsamifera, 500 
candicans, 500 
tremuloides, 500 
Pore Fungi, 404 
Porella, 418, 419 
Pores, 108, 110 
bordered, 136 
germ, 282 
Portulaca, 301, 514 
Postelsia, 354 
Potash, solutions of, 685 
Potassium ferrocyanide solution, 685 
Potato, 87, 192, 272, 596 
starch of, 79, 81 
Potentilla, 269, 535 
silvestris, 536 
Prefloration, 264 
Prefoliation, 230 
Premna arborea, 593 
Prickles, 189 
Prickly Ash, 546 
Prickly Pear, 567 
779 
Primary Meristems, 113 
- of root, 157 
Primordial meristem, 111 
of leaf, 228 
Primulacea, placentation in, 288 
Principes, 485 
Prinos, 552 
Privet, 261, 683 
California, 170 
Procambium, 113 
Prodromus, 326 
Proembryo, 348 
Promycelium, 397, 398, 401 
Prophases, in nuclear division, 48, 49 
Proplastids, 42 
Prosopis juliflora, 540 
Prostele, 145 
Proteacea, 254 
Protective tissues, 151 
Proteinaceous enzymes, 103 
Proteinoplastids, 133 
Proteins, 92 
formation of, 65 
tests for, 93 
Prothallia, female, 438 
Fig. of fern, 69 
male, 438 
Prothallial cushion, 69 
Prothallium, 68 
Fig. of fern,-70 
Prothallus, 68, 451, 460 
Protista, 30 
Protoascales, 381 
Protococcales, 337 
Protoderm, 113 
Protonema, 68, 426 
Protopectin, 107 
Protopectinase, 102 
Protophloem, 144 
Protoplasm, 10, 25, 30 
properties of, 30, 31 
Protoplasmic cell contents, 40 
Protoplasmic movement, 39, 40 
Protoplast, 17 
Protoxylem, 143, 168, 169, 196 
Protozoa, 24 
Prune, 305 
Prunum, 536 
