Entophytes, characters of the group of, i. 275, 276 sporangia, or spore-cells, of, i. 279 Entozoa, characters of the order of, ii. 144 transformations of the young of the, ii. 146 Eolis, the crowned, structure of, ii. 240, 241 Eozoön Canadense, may be regarded as the first appearance of animal life upon the earth, ii. 54 found in fundamental quartz rocks, ii. 54 structure of, ii. 55 range of its existence, ii. 56 Epipactis palustris, structure and mode of reproduction of, i. 397, 398 Epiphytes, characters of the group of, i. 275 Epithemia, mode of development of, i. 202 Epizoa, or suctorial crustacea, structure, habitat, and mode of reproduction of, ii. 212 Equisetaceæ, or horse-tails, characters of, i. 367 contrasted with ferns, i. 369 large quantity of silex in, i. 369 size and habitat of fossil and existing species, i. 369 Equisetum giganteum, structure and fructification of, i. 368 Ergot, Cordyceps the second form of, i. 293 Errantia, structure and habitat of the, ii. 156, 157, 161 Erysiphe, mildew formed by, i. 295 Eschara, structure of, ii. 218 Ether, sulphuric absorption of radiant heat by, i. 40 Eucamptodon perichætialis, leaves of, i. 330 Eucyrtidium, structure of, ii. 20 Euglena acus, structure of, ii. 72 Euglena sanguinea, structure of, ii. 72 Euglena, structure of the genus, ii. 72 Euglyphæ, structure and habitat of, ii. 22 Eunice, structure of, ii. 157 mode of reproduction of, ii. 160 Euparmeliaceæ, characters of the group, i. 304 Euphorbiaceæ, or spurgeworts, poisons and food supplied by the, i. 425, 426 Evernia flavicans, colour of, i. 303 Evernia jubata, structure of, i. 302 Evernia vulpina, i. 303 brown dye obtained from, i. 303 Exchange, law of, i. 35 independent proofs of the, i. 35, _note_ Exidia Auricula Judæ, or Jew’s Ear fungus, structure and fructification of, i. 266 Excœcaria Agallocha, poison of the, i. 426 Exogenous plants, i. 404-408 Eyes of man, fungi in, i. 275 F Fairy rings of the fields, i. 262 Faujasina, structure of, ii. 45 Felspar, fluorescence of, i. 66 Fermentation, fungi producing, i. 286-288 minuteness and lowness of organization of the ferments, ii. 68 habitat of the, ii. 68 Fibrin, formation and structure of, in vegetable organisms, i. 423 Fig, common, juices of fruit of, changed into sugar, i. 426 poison of the white juice of the, i. 426 Filariæ, structure and mode of reproduction of, ii. 147