INDEX. 



Seeds, cold resistance, i. 544. 



— defensive arrangements, ii. 442. 



— dimensions of, ii. 839. 



— dispersal by birds, ii. 444. 



— germinating, i. 607. 

 force of, i. 516. 



temperatures, i. 557 ; ii, 488. 



— iieat resistance, i. 555. 



— lightness of, ii. 851. 



— number produced, ii. 878. 



— of ConiferjB, ii. 442, 443. 

 dispersal, ii. 439. 



— of Orchids, structure, &c., i. 377. 



— of parasites, germination, i. 171. 



— propagation of hybrids by, ii. 556. 



— protection against wet, ii. 448. 



— resting of, i. 563. 



— rugged, fixation, i. 616. 



— size and weight, ii. 451. 



— vitality of, i. 51. 



— with reserve-tissue, ii. 422. 

 Selaginella, characteristics, ii. 477. 



— chlorophyll-granules, i. 373. 



— general structure, ii. 715. 



— sexual reproductive organs, ii. 69. 

 Selaginella Helvetica, inequality of leaves, 



i. 422. 



leaf-mosaic, i. 421. 



Selaginella selaginoides, British, ii. 715. 

 Selaginellaceaj, description, ii. 715. 

 Selection, natural, theory of, ii. 600. 

 Self-fertilization and dichogamy, ii. 314. 



of flowers, ii. 291. 



Self-pollination, occurrence, ii. 331. 

 Semi-shrubs, spines of, i. 444. 

 Serapervivuin, and animals, i. 432. 



— leaf -rosettes, i. 410. 



— stolons, i. 663. 



Sempervivum hirtum, attacked by Eudo- 

 phylhmi Sempervivi, ii. 523. 



Sempervivum montanum, autogamy, ii. 344. 



cold resistance, i. 543. 



prey capturing, i. 155. 



sticlcy foliage, ii. 236. 



Sempervivum soboliferum, vegetative propa- 

 gation, ii. 821. 



Sempervivum tectorum, stomata, i. 2S0. 



Sempervivum Wulfenii, cold resistance, i. 543. 



Seuecio erucsefolius, cotyledons, i. 621. 



Senecio nemorensis and S. nebrodensis, 

 anthocyanin, i. 520. 



Senecio viscosus, florets and autogamy, ii, 363. 



Senecio vulgaris, effect of dry soil, ii. 500. 



light and growth, ii. 508. 



pericarp mucilage, i. 615. 



■ seed-dispersal, ii. 857. 



Sensation, in plants, i. 53. 



Sensitive plants, i. 535. 



— and nocturnal radiation, i. 530. 



— change of colour and function, i. 376. 

 Separation-layer, formation, i. 359. 

 Sequoia gigantea, ii. 725. 



dimensions, i. 722. 



Serjania, extra-axillary buds, ii. 28. 



Serjania gramatophora, branch - tendrils, i. 

 693, 694. 



Serratula lycopif olia, protection by Ants from 

 Beetle, ii. 242. 



Sesleria, leaf-folding, i. 340. 



Sesleria coerulea, ring i.irmation, ii. 792. 



Sesleria tenuifoUa, leaf, section, i. 341. 



Setaria Italica, polUnatiou, ii. 142. 



Setaria verticillata, hooked fruit, ii. 871. 



Sexual and asexual generations, mutual re- 

 lations, ii. 474. 



Sexual System of classification, ii. 601. 



Seychelles Palm. See Lodoicea Sechellarum. 



Shade, effect on growth of plants, ii. 506. 



Shepherd's Purse. See Capsdla Bursa- 

 pastoris. 



Shoot, acropetal development, i. 396. 



— morphological value, i. 333. 

 Shoot-apices of Rotangs, i. 676. 

 Shoots, asexual, dissimilarity, ii. 471. 



— epiphyllous, ii. 37. 



— reserve, leaf characteristics, ii. 516. 



— spinose, i. 443. 



Shoots, undercronnd, important function i 

 653. ■ ■ 



Shore Pine. See Pinm Halepensis. 

 Shrubs, foliage-leaves and rain, i. 93. 

 Sibbaldia, dehiscence of pollen-sacs, ii. 92. 



— honey, ii. 173. 



Sibbaldia procumbens, habit, i. 6C2. 



stamen, ii. 91. 



Siberian Crab. See Pyrus aalicifoUa. 

 Sideritis Romana, colour-contrast in flower, 



ii. 191. 

 Sideritis scordioides, pollen-grains, u. 99. 

 Sieve-plates, i. 469. 

 Sieve-tube, i. 469. 



of Macrocystis, ii. 663. 



of Nereocystis, ii. 663. 



SigUlariaceaj, characteristics, ii. 716. 



Signatures, doctrine of, i. 2. 



Silene and Lychnis, poUen-grains, ii. 99. 



— pollination experiments, ii. 404. 



Silene acaulis, distribution of sexes, ii. 300. 



vertical range, ii. 750. 



Silene conica, autogamy, ii. 336. 

 Silene Elizabethaj, and humble-bees, ii. 239. 

 Silene longiflora, and night visitors, ii. 196. 

 Silene noctiflora, behaviour to own and 

 foreign pollen, ii. 407. 



opening of flower, ii. 212. 



weather and autogamy, ii. 391. 



Silene nutans, and night visitors, ii. 196. 



capsules in dry and wet weather, ii. 448. 



closed flowers, ii. 154. 



distribution of sexes, ii. 300. 



double protection of honey, ii. 242. 



open flowers, ii. 155. 



pollination, ii. 154. 



scent, ii. 201. 



seed protection and dispersal, ii. 447. 



Silene Saxifraga, and night visitors, ii. 196. 



cross-fertilization, ii. 307. 



opening of flower, ii. 212. 



Silene Vallesia, opening of flower, ii. 212. 

 Siiene vespertina, opening of flower, ii. 212. 

 Silene viscosa, carnivorous in minor degree, 



i. 156. 

 Siler, geitonogamy, ii. 324. 

 Silica, in cell-wall of Diatoms, ii. 625. 



— in Equisetuni, ii. 712. 



— in hairs of Rochea, i. 325. 



Siliceous marl, composed of Diatoms, ii. 627. 



Silicic acid, in Diatom frustules though no 



trace in aqueous habitat, i. 70. 



accumulation through plants, i. 261. 



occurrence in plants, i. 67. 



Silicification, and animals, i. 432. 



— and preservation of fossil plants, ii. 612. 



— of hairs, i. 441. 



Silicon, in ash of plant, i. 66. 



Siliqua, morphology, ii. 432. 



Silk-worms, attacked by a Cordyceps, i. 168. 



Silky hairs, i. 320. 



Silphium laciniatum, a "compass plant", i. 

 337. 



Silphium perfoliatum, mechanical tissue 

 arrangement, i. 731. 



water-receptacles, i. 239 ; ii. 234. 



Silver Fir. See Abies pectinala. 



Silver Tree. See Lcucadendron argenleum. 



Silybum Marianum, method of water-con- 

 duction, i. 98. 



Sinapis, poUen-grain, ii. 100. 



Sinapis arvensis, autogamy, ii. 348. 



duration of flowering, ii. 213. 



Sinkers, of Mistletoe, i. 209. 



Siphonaceae, fertilization and fruit-forma- 

 tion, ii. 53. 



Siphonese, description, ii. 641. 



— differentiation of thallus, ii. 620. 

 Sisymbrium Thalianum, protection of pollen, 



ii. 121. 

 Sisyrinchium, nectary, ii. 176. 

 Sisyrinchium anceps, colour-contrast in 

 flower, ii. 190. 



weather and autogamy, ii. 391. 



Skatol, nature of, ii. 199. 

 Skin-diseases, due to Fungi, i. 168. 

 Skull-cap. See ScuttUaria. 



Sloe. 8fC /'mniu rptno*a 



Sliign, prr.t 



'..Miiuit. II n* 



int«, 1. 431 

 !•«. I. MV. 



Smilaccjidiau. cl.»fiu;(crl«tic Ii. 731 

 Smilax osiierm, itlpuUr U-ndriU. L 0M 

 Smithia seniilir*, and r»ln. I S37. 

 Sniymium, ooloutMl brmct*. II UJ. 

 Suuili, OS limcoccumulatiin in lop Ur«n of 

 soil, i. 259. 



— elevation ttiiil <■., I,, r-,i,..,. ., jjj 



— proteclirM. 



Snake-root. - ru. 



Snow, OS pp - . , .1 jjj. 



— duBt-collcctor. i. '■II 



— effect on foliage, i. 358. 



— melting by devclopinK flowrrboiU, L I9t 



— protection of pUnLi. i. M8 

 Snowdrop. .Soc GafanfAiu nimib. 

 Snow-fall and elevation, i V.a 

 Snow prcs.suro and growtli, I 523. 

 Sodium, in ash of planU. i. GC. 



— in marine plants, i. 68. 



— phosphate, as foodsalt, 1. 67. 



— salts of, accumulatiou tbrouxb pUoUL L 



261. 

 Soil and specific differenoes, ezperimeat^ U. 

 496. 



— changes, in, due to nutrition of plaaU, 



i. 257 ct seq. 



— clay, conditions of growth on, il. 500 



— effect on flowering, i. 9. 



— factors determining nutrition, I lOl 



— on trees, i. 106. 



— retention of water, ii. 499. 



— sandy, conditions of growth on, ii. 500. 



— temperature in Alps, i. 525. 

 Solanaceie. ii. 771. 



— aestivation io, Ii. 210. 



— autogamy in, ii. 3Cfi 



— diversity of pollen prot< rtion, II. 128. 



— extra-axillary buds, Ii. 2* 



— nectary concealment, ii. 181. 

 Solanum Dulcumara, berry, ii. 437 



colour-contrast of flowers, il. IS. 



twining, i. 689. 



Solanum I.yc«|>ersicuin, anther, ii 90. 



movements of cotyletlona, I. 531 



stamen, ii. 91. 



Solanum sisymbrifolium, fniit 



ii. 445. 

 Solanum sodomn-tim. fniit f>r"t»^i'»r il 



Solanum tul"- ~'' 



colour 



co'si;''- ''■' 



dimiiii'-! 



protection .f i-.llui. ii 1:V. l.> 



tuber, i. 651. 



yniine fniit. il. 73. 



SoMv " • --r. Ii. 3SS. 



-1. 11.180. 



,. if»0, J75 

 tnij, II. 3fi& 

 appMBlua, a S7& 



Soldai.. :ia ■ 

 SolfnUra. N 



8<ini'hii» :i:' 



Sorbiu, dedduutu protactivv baink I SM 



