when Palladium Foil is heated in Air at a loiu Pressure. 579 
a ring about three-quarters of an inch in thickness all round the 
hot palladium foil, apparently separated, as has been explained, by 
the space of about half an inch. 
This experiment was repeated with palladium obtained from 
different sources, always with the same result. Experiments are 
in progress to determine the conditions under which this effect is 
produced, and to test some explanations which suggest themselves 
as to its nature. 
VOL. XIV. PT. VI. 
38 
