on the Polarity of the Biamagnetic Force. 175 



deflection corresponding to five divisions of the scale. As in all 

 other cases, the impulsion of the magnet might be augmented 

 by changing the position of the cylinders at the limit of each 

 swing. The deflections are the same in kind as those produced 

 by bismuth, which ought to be the case, as marble is diamag- 

 netic. 



An upright iron stove influenced by the earth's magnetism 

 becomes a magnet with its bottom a north and its top a south 

 pole. Doubtless, though in an immensely feebler degree, every 

 erect marble statue is a true diamagnet, with its head a north pole 

 and its feet a south pole. The same is certainly true of man as 

 he stands upon the earth's surface, for all the tissues of the 

 human body are diamagnetic. 



A pair of cylinders of phosphorus enclosed in thin glass tubes 

 were next examined. 



XII. 



Cylinders of Phosphorus. 



Length 3*5 inches. Diameter 0*63. 



Current direct. Current reversed. 

 Series I. Series II. 

 Position 1. 620 670 224 



Position 2. 618 668 226 



Position 3. 616 666 228 



The change of the bars from position 1 to 3 is in this case 

 accompanied by permanent deflection corresponding to four 

 divisions of the scale. The deflection indicates the polarity of 

 diamagnetic bodies. The magnet wa§ remarkably steady during 

 these experiments, and the consequent clearness and sharpness 

 of the result pleasant to observe. 



Xlll. 



Cylinders of Sulphur. 

 Length 6 inches. Diameter 0*7. 



Current direct. Current reversed. 

 Position ] . 658-5 222 



Position 2. 657 223*5 



Position 3. 655*5 225-5 



XIV. 



Cylinders of Nitre. 

 Length 3*5 inches. Diameter 0*7. 



Current direct. Current reversed. 

 Position 1. 648*5 263 



Position 3. 647 265 



