92 
Proceedings of the Royal Society of Edinburgh. [Sess. 
place. Originally fairly homogeneous, if we except the presence of a few 
small “ blow-holes,” the alloy now exhibited at least two constituents — 
large, irregular, and lustrous nodules appearing imbedded in the more 
uniform matrix. To such changes in structure we may probably ascribe 
the peculiar behaviour on quenching at 610°. 
The above research has been carried out in the Physical Laboratory of 
the University of Glasgow, and the author desires to take this opportunity 
of thanking Professor Gray and Dr Muir for suggestions received during 
the progress of the work. The preliminary experiments were carried 
out in collaboration with Mr Robert Jack, and the author proposes to 
continue the research on the lines indicated above. 
( Issued separately May 29 , 1907 .) 
