INDEX. 275 



Equisetacese, 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, Cordiceps 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 perichsetialis, leaves of, i. 330 

 Eucyrtidium, structure of, ii. 20 

 Eugl^na acus, structure of, ii. 72 

 Euglena sanguinea, structure of, ii. 72 

 Euglena, structure of the genus, ii. 72 

 Euglyphae, structure and habitat of, ii. 22 

 Eunice, structure of, ii. 157 



mode of reproduction of, ii. 160 

 Euparmeliacese, characters of the group, i. 304 

 Euphorbiacese, 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 Judse, or Jew's Ear fungus, structure and fructification 



of, i. 266 



Excoecaria Agallocha, poison of the, i. 426 

 Exogenous plants, i. 404-408 

 Eyes of man, fungi in, i. 275 



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 



T 2 



