944 



Digitalis, and insect visits, ii. 222. 



— as insect shelter, ii. 163. 



— bees and pollen, ii. 247. 



— corolla and autogamy, ii. 367. 



— efltect of mutilation, ii. 517. 



— one-sided raceme, ii. 224. 



— ovary, ii. 76. 



— protandrous, ii. 311. 



— protection of pollen, ii. 118. 



— spurred hybrids, ii. 576. 



Digitalis grandiflora, attraction of foreign 

 pollen-tubes by ovules, ii. 414. 



Digitahs lutescens, sheltering of pollen, ii. 

 110. 



Digitalis ochroleuca, elevation and colora- 

 tion, ii. 511. 



Digitalis purpurea, duration of flowering, ii. 



flower-opening constant, i. 559. [213. 



temperature experiments, i. 502. 



Dill. See Anethum graveolens. 



Dimorpliic fruits, ii. 878. 



Dinifera, group of Dinoflagellata, Ii. 625. 



Dinoflagellata, animal afiinities, ii. 620. 



— description, ii. 625. 



Dioecious flowers, and wind-fertilization, ii. 

 134. 



— plant, type, ii. 299. 



— plants and hybridization, ii. 314. 



majority protogyuous, ii. 313. 



pollination, ii. 136. 



Dionsea, advantage of carnivorous habit 

 questioned, i. 157. 



— leaf compared to that of Drosera, i. 151. 



— ovary, ii. 75. 



Diouifia muscipula, i. 148, 150, 340, 536. 

 Dioon, Central America, ii. 720. 

 Dioscorea, mechanical tissue, i. 732. 



— poUen-grains, ii. 99. 



— seed-dispersal, ii. 852. 

 Dioscorides, i. 4. 



Diospyros Lotus, imperfect flowers, ii. 294. 

 Diphtheria, i. 163, 506 ; ii. 624. 

 DiplochlamydesB, of De Candolle, ii. 603. 

 Diplosis, escape of larvse from gaUs, ii. 538. 

 Diplosis botularia, gaD on Ash leaf, ii. 534. 

 Diplosis tremula;, gall on Aspen petiole, ii. 



540. 

 Diplotaxis, dehiscence of pollen-sacs, ii. 93. 



— twisting of anther, ii. 250. 

 Dipsacese, ii. 352, 765. 



— distribution of sexes, ii. 298. 



— insects and pollen, ii. 244. 



— pollen deposition in, ii. 278. 



— water receptacles, i. 156. 

 Dipsacus, protective water basins, ii. 234. 

 Dipsacus laciuiatus, water- receptacles, i. 



239, 242. 

 Diptera, gall formation, ii. 527. 

 Diptero-cecidia, gnat-galls, ii. 528. 

 Disa, S. Africa, ii. 737. 

 Disciflorae, ii. 777. 

 Discolichenes, characters, ii. 693. 



— subdivision, ii. 694. 

 Discomycetes, i. 168 ; ii. 19, 676, 682, 683. 



— as lichen-fungi, ii. 693. 



— mode of attack, i. 163. 

 Discopodium, i. 746. 

 Disc-shaped receptacle, i. 746. 

 Disease, due to bacteria, i. 163. 



Dishes, water-collecting, of plants, position, 



i. 240. 

 Dispersal of offshoots, by animals, ii. 827. 



general remarks, ii. 832. 



Displacement, of leaf, by torsion, i. 407. 



— of whorls, i. 397. 

 Dissemination and germination, i. 614. 



— of respective partners of Lichen-thallus, 



i. 246. 

 Distribution and climate, ii. 879. 



— conditions affecting, ii. 2. 



— of plants, and heat, i. 527. 

 Divergence of leaves, i. 397, 403. 

 Division, of cells, i. 576. 



— of labour, i. 251, 367, 561, 594. 

 Doctrine of prolepsis, i. 8. 

 Dodder. See Cuscuta. 

 Dodecatbeon, autogamy, ii. 333. 



Dog's Mercury. See Mercurialis perennis. 

 Dog's-tooth Violet. See Erythronium Dens- 



Canis. 

 Dogwood. See Comus sanouinea. 

 Dolomite, attacked by Lichens, i. 257. 



— prevalence of, i. 83. 



Doria, pericarp mucilage, i. 615. 

 Dormant buds, ii. 30. 



— eye, natm-e of, ii. 30, 34. 



Doronicum, artificially induced drooping, ii. 

 123. 



— protection of pollen, ii. 120. 

 Doronicum cordatum, dichogamy, ii. 312. 

 Doronicum glacials, geitonogamy, ii. 322. 

 Doronicum Pardalianches, opening of 



flowers and growth, ii. 220. 

 Doronicum scorpioides, geitonogamy, ii. 



322. 

 Dorsal suture, of foUicle, &c., ii. 430. 

 Dorsteniaceae, ii. 758. 



— on trees and rocks, i. 156, 108. 

 — - seed-dispersal, ii. 835. 

 Dorycnium decumbens, ash of, i. 69. 



isolated colonies, i. 528. 



Dorycnium herbaceum, seed-dispersal, ii. 833. 

 Doryphora, stamens, ii. 87, 89. 



— staminal stipules, ii. 89. 

 Double flowers, i. 646. 



abortive poUen, ii. 403. 



due to gall-mites, ii. 548. 



long fresh, ii. 28T- 



origin, ii. 86. 



Douglas Fir. See Tsuga Douglasii. 

 Doum Palm. See Hyphcene thehaica. 

 Draba, hybridization, ii. 584. 



— indumenta of hybrids, ii. 564. 



— nectary, ii. 175. 



Draba aizoides, autogamy, ii. 337. 



colour-contrast in inflorescence, il. 192. 



protection of pollen, ii. 121. 



Draba alpina, absence of hairs, ii. 316. 



Draba borealis, autogamy, ii. 339. 



Draba Hoppeana, hybrid of D. Fladnizensis 



X D. Carinthiaca, u. 586. 

 Draba repens, unfruitful artificial autogamy, 



ii. 406. 

 Draba stellata, habitat and hairiness, i. 315. 

 Draba Thomasii, hairs, i. 321. 

 Draba tomentosa, habitat and hairiness, i 



315. 

 Draba vema, autogamy, ii. 339. 



colour-contrast in infiorescence, ii. 192. 



Dracjena, mode of growth, i. 660. 



Dracaena Draco, geographical distribution, 



&c., ii. 731. 

 of Orotava, age and dimensions, i. 714, 



720. 

 Dracocephalum, pericarp mucilage, i. 615. 

 Dracocephalum Ruyschianum, elevation and 



coloration, ii. 511. 

 Dracontium, tubers, ii. 745. 

 Dracunculus creticus, and carrion-flies and 

 beetles, ii. 208. 



&c., insect visitors, ii. 165. 



Dragon-tree. See Dracmia Draco. 

 Draparnaldia, differentiation of thaHus, ii. 



620. 



— swarm-spores, i. 29, 30. 



— thaUus, ii. 652. 



Drimys, pollen tetrads, ii. 97. 

 Dropwort. See Spiraa Filipendula. 

 Drosera, i. 143, 154, 158, 237, 536. 



— arrangement of leaves, &c., i. 144. 



— autogamy, ii. 356. 



— comparison of leaf with that of Dionsea, 



i. 151. 



— digestion of prey, i. 146. 



— duration of blossoming, ii. 214. 



— glands, i. 144. 



— great number of species, i. 143, 148. 



— nectaries, ii. 178. 



— ovary, ii. 75. 



— ovule, ii. 82. 



— pollen-sacs, ii. 89. 



— stigma, ii. 282. 



— tentacles and their movements, i. 145. 

 Drosera intermedia, antholysis, ii. 83. 



Drosera longifolia, duration of 

 ii. 214. 



flower, ii. 279. 



opening and closing, ii. 212. 



stigma, ii. 279. 



weather and autogamy, ii. 391. 



Drosera obovata, hybrid of D. longifolia x 



D. rotundifolia, ii. 586. 

 Drosera rotundifolia, carnivorous, habitat. 



i. 143. 

 DroseraceM, genera of, i. 148. 



— movements of stamens, ii. 250 

 Drosophyllum, i. 148. 



— description, i. 154. 



— epiphyllous secretory glands, i. 157. 



— ovary, ii. 75. 



— used as lime-twigs, i. 155. 

 Drosophyllum lusitanicum, i. 155; ii. 237. 

 Drupaceous nut, nature of, ii. 429. 



of Fumaria, ii. 427. 



Drupe, nature of, ii. 428. 



Dryadeee, protection of pollen, ii. 118. 



Dryandra, inflorescence, ii. 230. 



— pollination, ii. 230. 



Drjandra floribunda, protection of stomata 



from moisture, i. 296, 298. 

 Dryas, receptacle and carpels, ii. 76. 

 Di7aa octopetala, i. 303, 304. 



autogamy in, ii. 381. 



distribution of sexes, ii. 298 



procumbent habit, i. G62. 



DrjTiess, preventive of decay, i. 262. 



— seed protection against, ii. 447. 

 Dryobalanops, seed-dispersal, ii. 854. 

 Dryoterus terminalis, bud-galls on Oak, ii. 



543. 

 Dry-rot, i. 508. 



Dry-rot Fungus. See MeruUus lacrumans. 

 Du Bois Raymond, compares dynamical 



with morphological description, i. 17. 

 Duckweed. See Lemna. 

 Ducts, for collecting water, in foliage-leaves, 



i. 231. 

 Dudresnaya coccinea, antheridia, &c., ii. CI. 



fertilization and fruit formation, ii. 53. 



Dulcite, alluring, i. 461. 



Dung-beetles, and colour and odour of 



flowers, ii. 197. 

 Durmast. See Quercus sessiliflora. 

 Durvillaja, habit, ii. 664. 

 DurvUlffia utihs, edible, ii. 665. 

 Dust, aerial, chemical substances in, i. 81. 



— circulation of, i. 81. 



— collection by Mosses and Lichens, &c., i. 



266. 



— in snow and air, i. 79. 



— meteoric, nature of, i. 80. 



— organic, food of rotifers, il. 255. 

 Dutch Rush. See Equisetum hiemale. 

 Duvaua longifolia, and gall of Cecidoses 



Eremite, ii. 534, 537, 539. 

 Dwarf Elder. See Sambucus Ebulus. 



— Leek. See Allium Chamcemoly. 



— male, of Qidogonium, ii. 651. 



— Palm. See Chamarops kumilis. 



Earth, properties and structure, i. 82-84. 



Earth-stars. See Geaster. 



Earwigs, protection against, ii. 445. 



East Indian Archipelago, Henslowia in, i. 204. 



Ebenacese, ii. 768. 



Ecballium Elaterium, seed-dispersal, ii. 834. 



Echeveria, epiphyllous buds, ii. 40. 



— leaf-rosettes, i. 410. 

 Echeverias, and cold, 1. 543. 



— Mexican, aqueous tissue, i. 328. 

 Echinocactus, i. 327. 



— and night visitors, ii. 196. 



— cross-fertilization, ii. 301. 



— spines, i. 446. 



Echinocactus horizontalis, ii. 787. 

 Echinocactus oxygonus, &c., size of flowera^ 



ii. 186. 



