INDEX. 



693 



Gutta percha, 237 



Gymnosperms ; calcium oxalate in, 22; 



reproduction of, 615 (Fig. 71), (Fig. 



76) 

 Gymnosporangium, 635 



Haberlandt, G. 



on decomposition of chlorophyll 

 by intense light, 265 



on erythrophyll, 267 



on minimum temperature of ger- 

 mination, 284 

 Haberlandt, F. 



on effect of high temperature on 

 seeds, 280, 281 



on maximum temperature of ger- 

 mination, 277 



on minimum temperature of ger- 

 mination, 270, 271, 272 

 Hsematococcus (Fig. i), i, u; repro- 

 duction of, 605 ; sensitiveness of zoo- 

 spores of, to light, 524 

 Hales 



on absorption of water by leaves, 

 66 



on force of absorption in im- 

 bibition, 37 



on loss by transpiration, 104 



on physiological significance of 

 transpiration, 115 



on root-pressure, 90, 94, 95 



on transpiration, 96, 104, 117 

 Hansgirg, on movements of Diatoms, 



520 

 Hanstein 



on distribution of organic sub- 

 stance in plants, 169 



on enchylema, 25 



on metaplasm, 23 

 Hartig 



on resin, 232 



on tannic acid, 237 



on transpiration, 98 

 Haulms of grasses, geotropic curvatures 



of, 466 



Haustoria, 411 



Heat, 268 ; cause of death from, 283 ; 

 conduction of, by wood, 315, 316; 

 evolution of, in fermentation, 307 ; in 

 germination, 303; in opening of 

 flowers (Garreau, Fig. 38), 308; 

 (Kraus), 308; (Dutrochet), 309 



fatal temperature for Bacteria, 279; 

 plants, 278; yeast, 279 



influence of, on formation of chloro- 

 phyll, 270; on germination, 269; on 

 growth, 402, 577 



loss of, by conduction, 313; radi- 

 ation, 313; transpiration, 313 



Heckel, on effect of anaesthetics on 

 motile stamens, 549, 551 



Hedysartim (Desmodiuni) gyrans, 533 ; 

 leaf of (Fig. 57), 535; sleep move- 

 ments of (Fig. 60), 542 



Heiden, on absorption of water by leaves, 

 66 



Heidenhain, on distribution of elec- 

 tricity in plants, 320, 322 



Heinrich, on evolution of oxygen at 

 low temperature, 271, 276, 277 



Heliotropic curvatures, cause of, 439; 

 distribution of, 437 ; latent period of, 

 435; mechanism of, 440, 579 



effect on, of direction of incident 

 rays, 432 ; of intensity of light, 432 ; 

 of rays of different wave length, 

 (Fig. 50), 433 



Heliotropic irritability, 436, 500; seat 



f 437 . 

 Heliotropism, 427, 590; negative, 428; 



positive, 428 ; transverse, 449 ; re- 

 versal of, 429, 443 

 Hellriegel, on constituents of clover-ash, 



130 



Hemipuccinia, life-history of, 635 

 Hemp seed, analysis of, 206 

 Henneberg, on retention of salts by 



soil, 49 

 Herapath, on ash of potato, 61, 62; on 



ash of oat plants, 63 

 Heredity, 649 

 Hermann 



on electricity, 323 

 on kinetic energy, 289 

 on nitrolin, 129 



Heron, on diastatic ferments, 191 

 Heterauxesis, 376, 422 

 Hetereecism, 633 



Heterosporous vascular plants, 603, 629 

 Heterostyled flowers, 647 

 Hibbertia dentata, twining of, 513 

 Hibernation, 269 

 Hilgers, on occurrence of oxalic acid in 



plants, 231 

 de la Hire, on absorption of carbon 



dioxide by green plants, 81 

 Histological differentiation, 10 

 Hlasiwetz, on resins, 236 

 Hofmann 



on the formation of compounds of 



nitrogen, 128 



on germination of Fungi at low 



temperature, 270 



on effects of high temperature on 



spores, 283 

 Hofmeister 



on instances of heliotropism, 428 

 on movement of plasmodia, 524, 



