290 INDEX. 



Loxades bursaria, mode of propagation of, ii. 75 

 Lucifer, characters of the genus, ii. 200 



matches, i. 17 

 Luminosity of the medusae in warm seas, ii. 99 



of Annelida, ii. 160 



of Pyrosomidse, ii. 226 



Lycoperdon giganteum, structure, habitat, and fructification of, i. 267 

 Lycoperdon, structure and fructification of, i. 267 

 Lycopodiacese, or club mosses, characters of, i. 373 



habitat and fructification of, i. 373, 374 



uses to which they have been applied, i. 374 

 Lycopodium, or wolf s-claw, characters of the genus, i. 374 

 Lycopodium clavatum, structure and habitat of, i. 374 



inflammability of the dried spores of, i. 374 

 Lycopodium inundatum, structure and habitat of, i. 374 

 Lygodium articulatum, structure of, i. 363 

 Lymnea, or pond snail, distoma of the, ii. 146 



M 



Macrocystis pyrifera, structure, habitat, and fructification of, i. 250 

 Macrura, characters of the, ii. 189 



fossil remains of, ii. 211 

 Madder, dyes obtained from, i. 124, 125 

 Magenta, or aniline red, Dr. Hofmann's discovery of, i. 122 



how produced, i. 122 



purple dye produced by mixing it with aniline, i. 123 

 Magnesium, i. 3, 4 



spectrum of, i. 65 



spectrum analysis of the rarefied vapour of, i. 142 



shown to be one of the metals existing in the sun, i. 151-153 



spectrum of the light of a magnesium flame, i. 153, 154 



its use in photography, i. 154 

 Magnetism, i. 30 



periodic and secular variations of, i. 30 



probably stand in some periodic connection with the solar spots 

 i. 30, 31 



probable cause of terrestrial magnetism, i. 31 



difference between magnetic and electric currents, i, 33 



