120 Mr. Barlow on the anomalous magnetic action 
whereby one author has noticed one fact, and another a diffe- 
rent one, without being aware how much depended upon a 
very slight change in the temperature of the iron. 
On these grounds therefore it is presumed, that the fol- 
lowing experiments would be entitled to some notice, as they 
serve to reconcile all these apparently contradictory state- 
ments; but the principal reason which has induced me to lay 
them before the Royal Society is, the anomalous action which 
they have been the means of discovering, while the iron 
passes through the shades of bright red and red, already 
alluded to in the preceding part of this paper, and which, to 
the best of my knowledge, has never been noticed by any 
author. 
Experiments on the anomalous attraction of heated iron which 
takes place while the metal retains the bright red and red heat , 
I have already observed, that this anomalous action was 
noticed while we were pursuing other experiments, and that 
those which follow, were wholly directed to an examination 
of these irregularities. 
In our first experiment, the compass was placed nearly 
west of the bar, rather below its upper extremity, and dis- 
tant from it about 6 \ inches. At the white heat the attrac- 
tion of the iron was lost ; and at the blood red heat we had 
70° of deviation in the needle; but that intermediate action 
we were searching after did not appear ; at least it was by 
no means so obvious as we had noticed it in our preceding 
experiments. 
The position of the bar and compass was not however quite 
the same as before ; we therefore raised the support of the bar 
