6 3 2 



L\DEX 



Wolkoff, 566 ; maximal intensity of light for 



photosynthesis, 340, 341. 

 Wollny, 175, 235, 251-3. " 

 Woodward, 127, 225, 241, 419; water-culture 



method of, 418. 



Wortmann, 158, 323, 392, 504, 538, 557. 

 - u. Stilling, on aniline dyes as antiseptics, 



96. 



Wossnesenski, 540. 

 Wotezal, 49, 604. 

 Wroblewski, 509. 

 Wundt, 9. 

 Wunschmann, 275, 280, 281. 



Xenomorphosis, 24. 

 Xerophily in swamp-plants, 231. 

 Xerophytes, 207, 236, 237 ; influence of soil 

 on, 231. 



Yeast, production of alcohol by, 553-561 ; 



ferment of, 502. 

 Yellow pigments, 316. 

 Yoshida, 437 ; on laccase, 509. 

 Yucca, 320; Y. filament osa, 319, 476. 

 Zacharias, 55, 118, 187, 314, 598, 600; 



absence of nuclei in sieve-tubes, 59 ; 



behaviour of nucleus during division, 56. 

 Zander, 582. 

 Zea Mays, 91, 114, 134, 156, 247, 334; 



bleeding of, 256 ; exosmosis of nutri- 



ment from endosperm of, 95 ; influence 

 of temperature on intramolecular re- 

 spiration of, 537 ; seedling of, 597, 

 Fig. 70 ; self-depletion of endosperm of, 

 598. 



Ziegenbein, 466, 563 ; influence of tempera- 

 ture on respiration, 561, 562. 



Zimmermann, 41, 51, 53, 66, 68, 118, 306, 

 312-9, 427, 428, 435, 450, 460, 475, 

 479, 481-3, 495, 598 ; on absorption of 

 nuclear membrane, 56 ; calcium pectate 

 in cell-walls, 133 ; cilia, 47 ; honeycomb 

 structure of protoplasm, 44 ; nemato- 

 plasts, 48 ; nucleus, 47 ; optical pro- 

 perties, influence of mechanical strains 

 on, 82 ; - of cell-walls and starch 

 grains, 78 ; phloroglucin in cell-sap, 

 97; plasmatic threads, 59, 60; --origin 

 of, 113-5; plastids, 43 ; Schizophy tes, 43. 



Zinc, occurrence of, in plants, 436 ; - - in 

 wood, 438 ; influence of, on growth, 436. 



Zinsser, 513 ; on root-tubercle bacteria, 399- 

 401. 



Zoller, 172, 490, 585. 



Zoochloranthellae, 306. 



Zopf, 173, 276, 316, 368, 376-8, 386, 414. 

 450, 604 ; on pigments of fungi, 495. 



Zukal, 604. 



Zygnema cruciatum, 312, Fig. 46. 



Zymogen, 503. 



