1912-13.] Sensitive Magnetic State induced in Various Ways. 253 
sensitive state, we see the remarkable similarity of effect produced by the 
two methods of treatment. 
Passing now to the discussion of the results obtained for the different 
specimens, we have in fig. 4 (i.) the most interesting results for — 
Specimen I. (015 per cent. C). — The three curves shown are lettered as 
in the first part of the paper, the (a) curve showing the effect of increasing 
( a ) Percentage sensitive state due to application of stress. 
(&) ,, „ ,, removal ,, ,, 
(c) ,, ,, ,, application and removal of stress. 
the stress from 0 to w, the ( b ) curve showing the effect of decreasing the 
stress from w to 0, and the ( c ) curve showing the effect in producing 
sensitive state of the cycle O-w-O. 
As the stress is increased from 0 to 10 kilos, both (a) and ( b ) curves 
rise rapidly to a maximum. Further increase of stress is followed by a 
slight drop in the value of the sensitive state, but a second though lower 
maximum occurs about 15 kilos, and at the end of the range the curves are 
rising once more. The maxima and minima of the two curves occur at 
almost the same points, and the ( b ) curve lies entirely above the (a) curve, 
the percentage sensitive state due to decrease of stress being, indeed, about 
