INDEX. 293 



Metals: vaporization, i. 5 



spectra of volatilized metals, i. 64 



coloured light obtained from the combustion of the salts of different 

 metals, i. 132 



spectrum of, not always the same, i. 145 



number of the metals of which the spectra has been determined 

 i. 147 



metals shown to exist in the sun, i. 151-153 

 and not to exist in it, i. 154 



metals contained in every plant, i. 414 

 Meteorites probably not of solar origin, i. 153 

 Mica, opacity of, to the invisible rays, i. 65- 

 Mignonette, weight of the perfume of, i. 45 

 Mildew of the vine, hop, &c., i. 295 



the black mildews of the Azores and Ceylon, i. 297 

 Miliola, structure and habitat of, ii. 30 



abundance of, in the seas of the Eocene period, ii. 31 

 Miliolidae, characters of the order, ii. 30 

 Milk sap of plants, i. 425 



vessels of plants, i. 417 



Milleporse complanata or palinipora, structure of, ii. 141 

 Mimosa pudica, irritability of the tissues of, i. 432 

 Mind and matter connection between, ii. 5 

 Molecules of matter, i. 2 



cohesion of, i. 25 



unit of mechanical force, i. 26 



causes of the ethereal undulating motions of, i. 34, 35 



See Atoms 

 Mollusca, structure, habitat, and mode of reproduction of, ii. 229, et seq. 



shells of the, ii. 232 



naked, ii. 240 



winged, ii. 240 

 Monas corpusculus, extreme minuteness of, ii. 63, 67 



and of its ova, ii. 67 



Monocotyledonous, or endogenous plants, structure, growth, and repro- 

 duction of, i. 383 



seeds of this class, i. 383 



stems, or axes, i. 384 



remarkable plants belonging to the monocotyledons, i. 387 

 Monostoma, or one-mouthed medusae, structure and mode of repro- 

 duction of, ii. 97 

 Monormia, habitat and structure of, i. 212 



