180 Professor TyndalPs further Researches 



Two glass tubes were next filled with carbonate of iron in the 

 state of powder : the following are the results : — 



XXIV. 



Cylinders of Carbonate of Iron. 

 Length 4 inches. Diameter 0*5. 



Current direct. Current direct. Current direct. 



Position 1. 185 Position 2. 620 Position 3. 740 



In all these cases the deflections show that the bodies are polar 

 after the manner of iron. 



As the complement of the experiments made with diamagnetic 

 liquids, we now pass on to the examination of the polarity of mag- 

 netic liquids. A concentrated solution of sulphate of iron was 

 enclosed in two glass tubes and submitted to examination. 



XXV. 



Sulphate of Iron solution in tubes. 

 Length 4 inches. Diameter 0*65. 



Current direct. Current direct. Current direct. 



. Position 1. 548 Position 2. 600 Position 3. 648 



A solution of muriate of nickel, examined in the same 

 manner, gave the following results ; — 



XXVI. 



Muriate of Nickel solution in tubes. 

 Length 3*6 inches. Diameter 0*65. 



Current direct. Current reversed. 

 Position 1. 605 224 



Position 2. 632 200 



Position 3. 650 185 



A solution of muriate of cobalt yielded as follows : — 



XXVII. 



Muriate of Cobalt solution in tubes. 

 Length 3*6 inches. Diameter 0*65. 



Current direct. Current reversed. 

 Position 1. 630 262 



Position 2. 645 235 



Position 3. 660 202 



In all these cases we have ample evidence of a polar action the 

 reverse of that exhibited by diamagnetic hquids. These, I be- 

 lieve, are the first experiments on which the action of either 

 liquid magnets or liquid diamagnets upon a suspended steel 

 magnet has been exhibited. 



