INDEX. 291 



Magnetism : relations between the force of magnetism and the atoms of 



matter, i. 75 



all substances either magnetic or diamagnetic, i. 75 

 proof of the connection between the magnetic forces and crystalline 



structure, i. 76 



conduct of amorphous and isomorphous substances under magne- 

 tic influence, i. 76 



action of magnets upon matter most powerful in the line of maxi- 

 mum density, i. 76 

 conditions of the position which crystals take with regard to the 



magnetic force, i. 76 



magnetic changes in the relations and distances between the ulti- 

 mate atoms of matter, i. 77 

 effect of magnetism on the stratified appearance of the electric 



light, i. 78 



causes of the polarity of a magnet, according to Ampere, i. 80 

 action of magnetism on the stratified discharges of electric light, i. 82 

 illustration of the action of magnetism and electricity on light, i. 90 

 Maiden's hair fern, structure and habitat of, i. 359 

 Malixis paludosa, or bog malixis, structure and mode of reproduction of, 



i. 400 



Malic acid, chemical combination forming, i. 97 

 Manchineel, poison of the, i. 426 

 Manganese, peroxide of, relative weight of the atoms of oxygen and 



metal in, i. 99 



atomic weight of, compared with that of hydrogen, i. 100 

 peroxide of, combination forming, i. 104 

 Manihot, or Cassava, food obtained from the, i. 426 

 Marasmius Oreades, spawn of, i. 262 

 Marattia salicina used as food, i. 365 

 Marattiaceae, characters of the group, i. 364 

 Marchantia polymorpha, structure, development, fructification, and 



habitat of, i. 317-320 



Marchantiaceae, characters of the order, i, 317 

 Mars, the planet, spectrum of, i. 158, 161 

 Marsh-gas, i. 118 



amount of absorption of radiant heat by, i. 41 

 Marsilea, characters of the genus, i. 372 

 Marsileaceae, or Rhizospermse, characters of the tribe, i. 371 

 Matoninese, characters of the group, i. 344 

 Matter, molecules of, i. 2 



u 2 



