760 PLUCKER ON MAGNETIC AND DIAMAGNETIC FORCES. 



Thus the impure mercury used was diamagnetic afau higher 

 and magnetic at a lower temperature. This appears to arise 

 from the magnetic substances mixed with it, the magnetism of 

 which diminishes as the temperature increases. 



In conclusion, I am about to have an apparatus constructed 

 for the purpose of making accurate admeasurements, in which a 

 thermometer is fixed in the porcelain cup used for the separa- 

 tion, and is separated simultaneously with it ; this indicates the 

 temperature at each moment in which the intensity of the mag- 

 netism or diamagnetism of the substance to be examined is de- 

 termined. I shall then be in a condition to subject metallic 

 nickel to experiment. 



