MAGNETIC CONSTANTS. 76; 



Density. Coefficients. 



Sulphate of Copper 1-1265 +0-54. io~ a 



Nickel 1-0827 +1-46 



Iron -1923 +14*17 



,, -1728 +12-09 



Protochloride of Iron -0695 +6' 17 



2767 +24-21 



4334 +44-16 



Sulphate of Sesquioxide of Iron . . . '1587 + 9' 2 4 



Gases. 



Values in respect of water, the gases being taken at the pres- 

 sure 76 Cm. Faraday, f E. Becquerel. 



Oxygen +0*1295 +0*1823 



Air . +0-0253 +0-0383 



Nitrogen +0*0022 o 



Vacuum o 



Carbonic Acid o -0-0051 



Hydrogen -0*0007 



Ammonia 0*0037 0*002 



Cyanogen -0*0067 



Nitrous Oxide -0*018 



Nitric Oxide +0*0498 



Ethylene +0*0045 -0*0082 



Chlorine -0*0046 



Sulphurous Acid - 0*0005 



Specific Magnetism (for Equal Weights). 

 From Pliicker. \ 



Iron 100000 



Magnetic Oxide of Iron 40227 



Sesquioxide of Iron 286 



Hematite 134 



Specular Iron Ore 533 



Hydrate of Sesquioxide of Iron .... 156 



Sulphate ,, ,, in 



Sulphate of Protoxide of Iron 78 



Nitrate of Iron in concentrated solution . . 34 



Perchloride of Iron in concentrated solution . 98 



Persulphate ,, ,, ,, 58 



Protochloride ,, ,, ,, 84 



Protosulphate ,, ,, ,, . 126 



Oxide of Nickel 35 



Hydrate of Oxide of Nickel 106 



Hydrated Oxide of Manganese 70 



Protosesquioxide of Manganese 167 



f FARADAY. Experimental Researches, Vol. in., p. 497. 1853. 



J PLUCKER. Pogg. Ann., Vol. LXXIV., p. 321. 1888. For want of terms 

 of comparison, these numbers cannot be reduced to absolute measurements. 



