INDEX 



581 



Pome type of fruit, 78, 78*. 



Pond Lily society, 511*. 



Pondweed societies, 505. 



Porella, 415. 



Postelsia, 319. 



Potassium, as a soil constituent, 157. 



Potato Blight, 357, 358*, 359*, 360*. 



Potato scab, 348, 247*. 



Powdery Mildews, 373-375; on Apple 



leaf, 372; on Hop, 373*. 

 Powdery Scab of Irish Potato, 340, 



341*. 



Prairies, 508. 



Pressure within cells, 118. 

 Primary endosperm nucleus, 40. 

 Primary growth, 214. 

 Primary leaves, 234. 

 Primary meristems, 127. 

 Primary rays, 203, 201*. 

 Primary root, 102. 

 Primary veins, 245. 

 Procarp, 326, 326*. 

 Processes in cell activity, 116. 

 Promycelium, 394. 

 Prop roots, 139. 

 Propagation, by roots, 163-165; by 



stems, 225-233. 

 Prostrate stems, 172, 173. 

 Proteases, 284. 

 Protective tissues, 127. 

 Protection against transpiration, 266. 

 Proteins, 256, 280; kinds, 281. 

 Prothallial cell, 456. 

 Prothallus, 432, 432*. 

 Protoascales (Yeasts), 377, 377*. 

 Protococcales, 302; described, 307. 

 Protococcus, 307. 

 Protodiscales, 364; described, 377, 



376.* 



Protonema, 421. 

 Protoplasm, 39, 274; described, 113, 



114*. 



Protoplast, 113. 

 Protozoa, 155. 

 Pruning, 221-225. 

 Pseudopodium, 423. 

 Pteridophytes, 292; described, 425- 



411. 



Pteridosperms, 445. 

 Ptomaines, 283. 

 Puccinia Asparagi, 403. 

 Pucdnia graminis, 396-401. 

 Puffballs, 382; described, 389-392. 

 Pulsating vacuoles, 303, 303*; in 



Euglena, 330, 330*. 

 Pumpkin, flowers, 12, 12*; length of 



root system, 135. 

 Purity and analysis of seeds, 74. 

 Pyrenoid, 303, 303*. 

 Pyrenomycetales, 364; described, 



369-373. 

 Pyronema, 367, 367*. 



Quack Grass, 86. 

 Quarter-sawed Oak, 203, 202*. 

 Quetelet's law, 525, 526*. 

 Quince, 142. 



Raceme, 28, 28*, 32*. 



Rachilla, 20, 21*. 



Rachis, 20, 20*, 21*. 



Radicle, of Bean, 56, 56*; of Corn, 63, 

 102, 63*, 101*; development, 

 466, 467, 466*, 467*. 



Ranunculaceae, 481; flower, 481*. 



Raphe, 57, 57*. 



Rays, primary and secondary, 203. 



Receptacle, 12, 10*, 11*. 



Recessive character, 543. 



Red Algae, 296; described, 324 "329. 



Red Clover, flower, 23, 12*, 23*; fer- 

 tilization in, 42*; hard seeds, 69; 

 impurities in seeds of, 75*; life 

 cycle, 469*; ovule, 38*; pistil, 36, 

 35*; pollination, 47*; seedling, 

 109, 109*. 



Red Heart Rot, 389. 



Reduction division, 412, 413*; as re- 

 lated to segregation, 554, 555*. 



Regions of growth, in roots, 145, 149, 

 145*, 149*; in steins, 213, 214*, 

 215*. 



Reproductive tissues, 133. 



Reserve cellulose, 278, 279*. 



Reserve foods, 277. 



