618 Proceedings of the Eoyal Society of Edinburgh. [Sess. 
In Table IV. the “ sensitive states ” remaining, after varying amounts 
Table IV. — Effect of Vibration. 
Number of Falls . 
0 
1 
3 
5 
10 
25 
50 
Sensitive State 
100 
63 
51 
44 
38 
33 
27 
of vibration, are expressed as a percentage of the effect shown by a specimen 
tested directly after annealing. 
A specimen annealed at 900° C. and subjected to an exceedingly large 
number of falls still showed distinct evidence of the “ sensitive state.” This 
result was to be expected from the previous observations, as will be at once 
evident from fig. 1 . Id this diagram the percentage residual “ sensitive 
state ” is plotted against the number of falls which the specimen had ex- 
perienced. It will be observed that while the effect of the first fall is very 
