INDEX 



457 



Prop roots, 175, 176 

 Protection of seeds, 285 

 Proteins, 41, 43, 150, 164, 291 

 Protococcus, 30-32, 182 

 Protonema, 92 



Protoplasm, 12, 15, 34, 40, 55 

 Psalliota arvcnsis, 76 

 Psalliota campestris, 78 

 Pteridophytes, 312 

 Pteris aquilina, 97 

 Ptomains, 21 

 Puccinia, 73 

 Puccinia graminis, 69 

 Puffballs, 85 



Pulse family, 155, 229, 305 

 Pumpkin, 10 

 Pure varieties, 366 

 Putrefaction, 17 

 Pyrenoids, 40, 42 



Quack grass, 332 

 Quercus bicolor, 192 

 Quinin, 214 



Raceme, 141, 265 



Races, specialized, 69 



Radish, 176, 187 



Rafflesias, 181 



Ragweed, 341 



Raspberry, 284; rust, 72 



Redwoods, 134, 222, 223 



Reproduction, asexual, 57; of bac- 

 teria, 14; of bread mold, 57-59; 

 of Protococcus, 31; of Spirogyra, 

 45-48; of yeasts, 33, 36; saxual, 

 48, 57, 63, 66 



Resin of pine, 114, 115, 133 



Resin passages, 115, 117, 120 



Resins, 322 



Respiration, 13, 18, 34, 44, 177, 248- 

 250 



Rhizoids, of fern, 102, 103, 104; 

 of moss, 87, 88, 93 



Rhizophora conjugata, 176 



Rhizopus nigricans, 53-59 



| Rice, 313, 314 

 I Rockweed, 50 



Root hairs, 3, 4, 100, 121, 170, 173 



Roots, 4, 160-185; of bean, 140; 

 of climbing plants, 179, 198; 

 of cucumber, 4; of epiphytes, 

 183; of fern, 98, 100, 106, 107, 

 108; of Indian corn, 157, 158, 

 175; of parasitic plants, 179, 185; 

 of pine, 121, 130; of squash, 2, 3 



Rose family, 304 



Rose, leaf, 229; rusts, 72 



Rotation of crops, 336, 376, 387 



Rubber, 212 



Rue family, 305 



Runners, 204, 334 



Ruscus, 203 



Rusts, 60-73, 83 



Rye, 313; rusts, 69 



Saccharomyces, 37 



Salix discolor, 189 



Salvia glutinosa, pollination of, 269 



Saprophytic bacteria, 12, 1 6 



Saprophytic fungi, 55, 59, 80, 85 



Saprophytic seed plants, 179, 182, 301 



Sap wood, 1 1 8, 208 



Sargassum, 50 



Saxifrage family, 304 



Scale leaves, 114, 115, 119, 216, 234 



Scales of ferns, 97, 98 



Sderoderma vulgare, 85 



Screw pines, 1 75 



Seaweeds, 49 



Sedge family, 297 



Seed coats, i, 2, 127, 128, 152, 163 



Seed leaves, 1-3, 127, 150, 152, 163, 

 234 



Seed, of bean, 149-152; of bean, 

 germination, 152; of cucumber, 

 10 ; of Indian corn, 162-164; 

 of Indian corn, germination, 165; 

 of pine, 127-129; of pine, germi- 

 nation, 129; of squash, i, 2; of 

 squash, germination, 2, 3 



