314 Proceedings of the Royal Society of Edinburgh. [Sess. 
that obtained in the experimental verification (fig. 13), which is indeed 
minute, not being greater than B = 01 C.G.S. unit. But, as already 
indicated, narrow zones only, so far as this part of the investigation is 
concerned, have been considered, and under this limitation the general 
relationship of the various curves is as close as could have been expected. 
It may therefore be concluded that, when iron is left residually 
magnetised by the method of partial demagnetisation by reversals, the 
displacement in either direction of the broad equatorial belt found to 
be distinctive of complete demagnetisation by the same method, can on 
this view be readily traced in the experimental results. 
In conclusion I desire to express my indebtedness to the Royal Society 
of London for placing at my disposal Government grants for the purpose 
of prosecuting these researches. 
( Issued separately August 9, 1912.) 
