274 INDEX. 



Electricity : illustration of the action of electricity and magnetism on 

 , light, i. 90 



instances of the correlation of electricity and heat, i. 91 



voltaic electricity, and its combination and resolution of substances 

 according to the law of definite proportions, i. 94 



Faraday's law of the quantity of electricity required to separate and 

 unite the same atoms, i. 94 



superiority of voltaic over static electricity, i. 95 



electricity the most powerful instrument of analysis, i. 95 



capacity of atoms for electricity, i. 100 



a given quantity of electricity required to separate combined 

 substances into their component parts, i. 101 



spectrum analysis of the electric spark, i, 138 



development of electricity in plants and flowers, i. 430 



electric currents in the nerves and muscles of animals, ii. 7 

 Electro-chemical action in heterogeneous atoms of matter, i. 95 

 Electro-magnetic induction apparatus, i. 31 



Kuhmkorff's, i. 32 

 Elvellacei, characters of the, i. 290 

 Empusa Muscse, or fly fungus, i. 274 

 Encalypta vulgaris, organs of fructification of, i. 326 

 Encrinites, structure of, ii. 175 

 Endocarpei, structure and habitat of, i. 310 



Endocarpon lacteum, structure and organs of reproduction of, i. 299 

 Endogenous plants, i. 383-403 

 Enteromorpha, characters of the genus, i. 223 

 Enteromopha intestinalis, structure and habitat of, i. 223, 224 

 Entomostraca, characters of the, ii. 203 

 Sntophytes. 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, structxire of, ii. 240, 541 



Eozoo'n Canadense, may be regarded as the first appearance of animal 

 life upon the earth, ii. 64 



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 reproduc- 

 tion of, ii. 212 



