INDEX. 



689 



Desmicls, locomotion of, 520; reproduc- 

 tion of, 6 12 



Dcsmodium (Hedysarum) gyrans, leaf 

 of; sleep movements of (Fig. 60), 

 542, 544; spontaneous movement of, 



533. 537 



Dessaigne, on luminosity, 319 

 Destructive metabolism, 188 

 Detlefsen 



on excentric thickening of stems, 



353 



on localisation of geotropic and 

 hydrotropic irritability, 468, 480 

 Detmer 



on absorption of water by leaves, 66 

 on destructive metabolism, 292 

 on evolution of ammonia by germi- 

 nating seeds, 210 



exhalation of carbon dioxide by 

 plants in light, 260 



on germination at low temperature, 

 272 



on photoepinasty, 383, 444 

 on root-pressure, 95 

 Denlzia scabra, cliageotropism of, 472 

 Development of reproductive cells, 638 

 Diageotropism, 463, 470, 473, 501, 552 

 Diaheliotropism, 449, 55 1> 592 

 Diastase, 189; action of, on starch, 191; 



analysis of, 189 



Diatoms, locomotion of, 520; reproduc- 

 tion of, 613 

 Dichogamy, 647 



Didymium, heliotropism of, 527; in- 

 fluence of temperature on movement 

 of, 298 



Differentiation of tissues, 10 

 Diffusion currents ; effect of, on electrical 



potential, 322 

 Dicecism, 646 



Dioncea; action of anaesthetics on leaf 

 of, 572; conduction of stimuli in leaf 

 of, 587; distribution of electrical 

 potential on leaf of (Fig. 39), 320; 

 movements of leaf of (Figs. 62, 63), 

 547 ; plastoid or rhabdoid in cells of 

 leaf of, 565 



Dioscorea Batatas, twining of, 517 

 Dippel 



on growth of cell- wall, 16 

 on movements of Diatoms, 520 

 on stratification, 17 



Dipsacus, absence of heliotropic irrita- 

 bility in, 431 



Discs, adhesive of tendrils, 411 

 Diurnal sleep of leaves, 551 

 Dodart, on geotropism, 456 

 Dodel-Port 



on extrusion of polar body, 641 

 on reproduction of Ulothrix, 606 



V. 



Dorsiventrality, induction of, 425 

 Dorsiventral organisation, 366; organs, 

 423; directive action of gravity on, 

 470; directive action of light on, 441 

 Draper 



on chlorophyll-spectrum, 156 

 on etiolin, 152 



on rays of spectrum which decom- 

 pose carbon dioxide, 254 

 Drechsel, on proteid crystals, 172 

 Drosera, aggregation in cell of, 564; 

 glands of (Fig. 33), 247 ; localisa- 

 tion of irritability in the gland, 548; 

 movements of tentacles of (Fig. 61), 



547; tentacles, 247, 533; transmission 



if of, 

 Drude 



of stimulus in the leaf of, 587 



on absorption of oxygen by Neottia, 



exhalation of carbon dioxide by 

 plants in light, 260 



on growth of leaves, 359 

 Drummond, on luminosity of plants, 317 

 Dubrunfaut, on inverted cane-sugar, 



192 

 Duchartre 



on absorption of water by leaves, 

 66 



on hydrotropism, 477 

 on positive heliotropism of Clavi- 

 ceps, 428 



on root-pressure, 92 

 on twining in darkness, 517 

 Ducluzeau, on luminous Algae, 317 

 Dudresnaya, reproduction of, 615 

 Duhamel 



on absence of geotropic irritability 

 in Mistletoe, 458 



on geotropism, 456 

 Dutrochet 



effect of temperature on circulation 

 in Chara, 297 



on evolution of heat by plants, 308, 

 310 



on heliotropism, 433 



on irritability of stem of Cuscuta, 



49 i 



on loss of heat by plants, 314, 315 



on Mimosa not motile in vacuo, 

 296, 548 



motile organs, 296 



on movement of leaf of Mimosa, 

 56o 



on negative heliotropism of Mistle- 

 toe, 429 



on relation between branches and 

 axes, 421 



on root-pressure, 90 



on rotation of protoplasm, 297 



on somatotropism of Mistletoe, 475 



44 



