256 Proceedings of the Royal Society of Edinburgh. [Sess. 
stress and heating correspond in producing a greater effect than the cyclic 
operations of application and removal of stress, and heating and cooling, 
for all stresses (except in the case of Specimen I.) and for low and moderate 
temperatures. 
On the other hand, the effects produced by strain are in general much 
less marked than those produced by thermal treatment, and the field for 
which the effect is a maximum is in the former case much lower. 
The phenomena in the two cases, then, while showing decided similarities, 
are far from being identical, and at the present stage of the research it is 
impossible to come to any conclusion as to whether there is a connection 
between them or not. 
The author desires to take this opportunity to express her indebtedness 
to Dr J. G. Gray for advice and assistance in the carrying out of the experi- 
ments, and to Professor Gray for the interest he has taken in the work. 
{Issued separately July 4, 1913.) 
