246 PECULIARITIES IN THE MAGNETISM 
81. The results of the above experiment (80) 
showed, in the most decisive manner, that the 
cool part of the iron was a perfect magnet, whilst 
the heated part was as perfectly neutral. 
EXPERIMENT 9. 
82. In this experiment the solid cylindrical 
iron bar, No. 2, was heated in the middle part, 
and kept cool at both ends. In this condition 
the bar, when placed in the magnetic dip, dis- 
played four magnetic poles indicative of two 
distinct magnets, one at each end of the bar; 
whilst the intervening heated part was perfectly 
neutral. The poles exhibited by the cool parts 
of the iron were of the same character as those 
which would have been displayed by them had 
they been two distinct pieces, without the inter- 
vention of the heated part, and the heated part 
entirely removed. 
EXPERIMENT 10. 
83. A long iron bar was now heated, to a bright 
redness, in two distinct parts, leaving both ex- 
tremities, and a portion in the middle, quite cool. 
The bar having been placed in the line of the 
