OF FERRUGINOUS BODIES. 215 
21. When the lamp was removed to the other 
side of the magnetic pole, the latter again receded 
JSrom the point of heat, as was obviously indicated 
by the retiring of the needle from its last position, 
which not only arrived at the meridian again, but 
passed over it to 1°°5. 
22. The lamp was again placed in its first 
position, (20,) and the needle again indicated the 
lateral motion of the magnetic pole, from the 
point of heat in the blade of the saw, as in the 
previous cases, (20, 21,) and by frequently plac- 
ing the flame of the lamp alternately in the two 
positions, corresponding motions of the needle 
uniformly indicated that the pole in the saw blade, 
which occasioned those motions, travelled from 
the point of heat ; though the distance passed 
over lessened gradually, and with an apparent 
regularity. 
23. Notwithstanding the accuracy with which 
these first results corresponded with the law of 
transplacement previously discovered in the 
direction of the magnetic axis,* it was necessary 
to ascertain its generality, if such existed, in other 
* Third Memoir, “ Annals of Electricity,” &c., vol. iv. 
