546 Proceedings of Royal Society of Edinburgh. [sess. 
molecular condition of iron which results from demagnetisation by- 
decreasing reversals. What may be called the normal curve to a 
great extent collapses, and its destructive characteristics are 
almost entirely lost. 
But ab may also be used to demagnetise the iron otherwise than 
by decreasing reversals. On its being simply withdrawn at 
various stages of the hysteresis loop, the different molecular con- 
ditions involved are likewise shown by curves measuring as before 
the induction component at right angles to H. 
The investigation is being continued. 
[Issued separately October 17 , 1903 .) 
