IXDEX 



457 



Prop roots, 175. 176 

 Protection of seeds, 285 

 Proteins, 41, 43, 150, 164, 291 

 Prolococcus, 30-32, 182 

 Protonema, 92 



Protoplasm, 12, 15, 34, 40, 55 

 Psalliola arvensis, 76 

 Psalliota campestris, 78 

 Pteridophrtes, 312 

 Pleris aquilina, 97 

 Ptomains, 21 

 Pucciuia, Js 

 Puccinia graminis, 69 

 Puffballs, 8s 



Pulse family, 155, 229, 305 

 Pumpkin, 10 

 Pure Narieties, 366 

 Putrefaction, 17 

 PjTenoids, 40, 42 



Rice, 313, 314 



Rockweed, 50 

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



Roots, 4, 169-185; of bean, 140; 

 ] of climbing plants, 179, 198; 

 I of cucumber, 4; of epiphytes, 

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

 ' 108; of Indian com, 157, 158, 

 I 175 ; of parasitic plants, 179, 185; 

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



Rose family, 304 

 I Rose, leaf, 229; rusts, 72 

 I RoO»tion of crops, 336, 376, 387 

 ! Rubber, 212 



Rue family, 305 



Runners, 204, 334 

 : Rusctis, 203 



Rusts, 60-73, 83 



Rye, 3r3 ; rusts, 69 



Quack grass, 332 

 Quercus bicolor, 192 

 Quinin, 214 



Raceme, r4r, 265 



Races, specialized, 69 



Radish, 176, 187 



RajHcsias. 181 



Ragweed, 341 



Raspberry, 284; rust, 72 



Redwoods, 134, 222, 223 



Reproduction, asexual, 57; of bac- 

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

 of Prolococcus, 31; of Spirogyra. 

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

 48, 57. 63, 66 



Resin of pine, 114, 11 5.. 133 



Resin passages, 115, 117, 120 



Resins, 322 



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



25° 

 Rhizoids, of fern, 102, 103, 104; 



of moss, 87, SS, 93 

 Rhizophora conjugata, 176 

 Rhizopms nigricans, 53-59 



I Saccharomyces, 37 



I Salix discolor, 189 



, Salvia glulinosa, poUination of, 269 



' Saproph}-tic bacteria, 12, 16 



Saprophj-tic fungi, 55, 59, 80, 85 

 I Saprophytic seed plants, 179, 182, 301 



Sapwood, 118, 208 



Sargassum, 50 



Saxifrage farmly, 304 



Scale leaves. 114, ir5, 119, 216, 234 



Scales of ferns, 97, 98 



Scleroderma mdgare, 85 



Screw pines, 175 



Seaweeds, 49 



Sedge family, 297 



Seed coats, 1, 2, 127, 128, 152, 163 



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



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

 germination, 152; of cucumber, 

 10; of Indian com, 162-164; 

 of Indian com, germination, 165 ; 

 of pine, 127—129; of pine, germi- 

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

 squash, germination, 2, 3 



