CONTENTS xiii 



of the fermentation of sugar 335- Digestion 336. Classification of enzymes 

 337- Origin and distribution of enzymes 338. Localization of digestion 339. Di- 

 gestion of starch 340. Enzymatic glands of seeds 341. Action of secretion from 

 scutellum on starch 342. Digestion of cellulose 343. Action of cellulose dissolv- 

 ing enzymes 344. Digestion of sugars 345. Digestion of proteids 346. Di- 

 gestion of albumen by Drosera 347. Digestive action of Nepenthes 348. Glands 



of the pitchers of Nepenthes 349. The clotting enzymes 350. Pectase 351. 



Oxidases 352. Demonstration of the presence of catalase and other oxidizing en- 

 zymes. 



XIII. GROWTH 276-307. 



353- Volume relations of protoplasm 354. Purpose of multiplication of cells 

 355. Cell-division 356. Growth and senescence of the cell 357. Size of cells 

 358. Average size and rate of growth of some unicellular organisms 359. Stages in 



the mitotic division of the nucleus 360. Amitotic division of cells in stems 361. 



Course of growth in cells in the apical regions of roots 362. Measurement of the 

 growth of the apical portion of a root 363. Growth of the body 364. Growth of 

 stems 365. Growth of petioles and peduncles 366. Growth of a leaf with parallel 

 veins 367. Growth of a leaf with netted veins 368. Course of growth 369. 

 Measurement of growth by a simple lever auxanomater and its use 370. A pre- 

 cision auxanometer and its use 371. Measurement of growth by weight 372. 

 Periodicity of growth 373. Rhythm 374. Modification of the grand period of 

 growth 375. Resting periods 376. Forcing 377. Influence of temperature 

 upon the resting periods 378. Conditions affecting growth 379. Influence of tem- 

 perature upon rate of growth 380. Age, senescence and death 381. Length of 

 life of an annual 382. Period necessary for maturity of cells of a stem 383. Sen- 

 escence and death in an annual plant 384. Death of a perennial 385. Correla- 

 tions in growth 386. Development of latent organs as a result of correlative stimu- 

 lation 387. Changes induced in flower stalks by fertilization 388. Correlative 

 changes in growth due to injuries 389. Movements due to correlations in growth 

 390. Epinasty, and hyponasty 391. Carpotropic and gametropic movements 392. 

 Carpotropic and gametropic movements of peduncles and other organs 393. Car- 

 potropic movements of aquatics. 



XIV. REPRODUCTION 308-327. 



394. Origin of new individuals 395. Multiplication of individuals as a result of 

 senescence and death of a part of the body of a plant 396. Division of individuals 

 in Marchantia, Azolla, Marsilea and Lycopodium 397- Propagation by gemmae 

 and other special bodies 398. Reproduction by gemmae of Georgia (Tetraphis) 

 pellucida 393. Propagation by modified leaves of Aulacomnion 400. Gemmae 

 of Scapania 401. Gemmae of Kantia 402. Gemmae of Marchantia and Lunu- 

 laria 403. Bulblets of Filix (Cystopteris) 404. Adventitious buds of Asplenium 

 bulbiferum 405. Adventitious buds of Polystichum angulare 406. Propagation of 

 Lycopodium 407 Vegetative reproduction by means of buds among the seed 

 plants 408. Origin of new plants from roots 409. Cuttings from roots 410. 

 Propagation by tuberous roots 411. Propagation by stems 412. Bulbs of Nar- 

 cissus 413. Propagation of Arisaema by buds 414. Propagation of Solanum by 

 tubers 415. Propagation by means of stolons, runners, offsets, etc. 416. Bulbils 

 of Lysimachia 417. Reproduction of Lilium by bulbils 418. Reproduction of 

 aquatic plants by buds 419. Grafts 420. Veneer grafting of herbaceous plants 

 421. Propagation by buds formed on leaves 422. Leaves of Begonia 423. 

 Formation of tubers and plants by leaves of Gloxinia 424. Propagation of Apios 

 tuberosa 425. Propagation by flowering branches 426. General nature and re- 

 lations of reproduction 427. Influence of external conditions upon Vaucheria. 



