PLUCKER ON DIAMAGNETIC POLARITY. 583 



elements; it was then difficult to determine whether it acted 

 magnetically or diamagnetically. With three elements however 

 it assumed a decidedly equatorial position, and the diamagnetic 

 force which brought it decidedly into this position continued to 

 increase on using a larger number of elements. I went on with 

 this experiment until I had used six elements. 



A second experiment with another piece of charcoal gave the 

 same result, except that with three elements it was still very 

 slightly magnetic, but with four elements it acted decidedly 

 diamagnetically. 



Hence, the distance remaining the same, augmentation of the 

 force of the poles of the magnet converts the magnetism of wood- 

 charcoal into diamagnetism. 



This result, which I had not before anticipated, but which was 

 to be expected in a purely theoretical point of view, appears to 

 me to form a remarkable confirmation of the theory of diamag- 

 netism adopted by Faraday, Reich, Weber and Poggendorff, in 

 which I now entirely coincide. 



Bonn, February 21, 1848. 



