Cystopus candidus, or Uredo candida, structure, habitat, and mode of reproduction of, i. 278
Cystopteris fragilis, or brittle bladder fern, structure and habitat of, i. 349
Cystoseira, structure and habitat of, i. 255
Cyttaria, the food of the Fuegians, i. 292 habitat of the, i. 292
Dactylocalyx pumiceus, spicula and skeleton of, ii. 60
Daphnia pulex, or arborescent water-flea, structure and mode of reproduction of, ii. 208
Datura sanguinea, intoxicating effect produced by a drink obtained from, i. 427
Davallia canariensis, or hare’s-foot fern, i. 351
Davallieæ, structure and habitat of, i. 350, 351
Dead bodies, agents in the decomposition of our, ii. 67
Decapods, tribes of the, ii. 188 characters of the, ii. 189
Delesseria angustissima, structure of, i. 243
Delesseria sanguinea, structure and habitat of, i. 239
Dendritina elegans, form of, ii. 28 structure of, ii. 32
Dendritine variety of the Peneroplis, characters and habitat of, ii. 32 fossils of, ii. 33
Deparia prolifera, sorus and indusium of, i. 350
Desmidiaceæ, structure and development of, i. 191 _et seq._ their habitat, i. 195
Dextrine, production of in plants, i. 421
Dialysis, as a method of separating and analysing substances, i. 108 what constitutes dialysis, i. 110 Prof. Graham’s instrument for, i. 110 an extraordinary result of, i. 110
Diamond, i. 13, 15 heat required to consume the, i. 15 crystallisation of the, i. 15 its resistance to electricity, i. 90
Diastase, production of, in plants, i. 420
Diatoma vulgare, structure and development of, i. 197
Diatomaceæ, or Brittleworts, found all over the globe, i. 196, 204 variety of forms of, i. 196 structure of, i, 197 development of, i. 200 social plants, i. 205 food for many aquatic animals, i. 205 fossil deposits of shells of, i. 206 enormous geological changes caused by, i. 206
Dicksonia antarctica, structure of, i. 349
Dicotyledonous, or exogenous, plants, structure and mode of reproduction of, i. 404-428
Dictyopodium trilobum, structure and habitat of, ii. 20
Dictyota dichotoma, structure and mode of reproduction of, i. 247
Dictyoteæ, structure and mode of reproduction of, i. 246
Dictyurus purpurascens, structure of, i. 242
Difflugia, structure and minuteness of the shells of, ii. 22 their architecture, ii. 23