OF FERRUGINOUS BODIES. 233 
was observable until the heat of the iron had subsi- 
ded to that stage of redness already described (59). 
61. Whilst the experiments with the tube were 
going on, two solid cylindrical bars of malleable 
iron, of precisely the same dimensions as the tube, 
were prepared, for the purpose of making com- 
parative experiments, and ascertaining the dif- 
ference, if any, of magnetic action of solid, and 
hollow iron, at high temperatures. The experi- 
ments with these solid bars were pursued in pre- 
cisely the same manner as those with the hollow 
bars, and the results were almost exactly the 
same, as is evinced by the following tabulated 
arrangement of them :— 
62. One end of each bar was marked A, and 
the other end B, for convenience of comparison 
and explanation. 
EXPERIMENT 1. 
Iron Tube End A, deflection 20° oes 
CAdeih Rad Bier ala re o 
White Hot ...... zero. Blood-red ...... 35° 
