248 Proceedings of the Royal Society of Edinburgh. [Sess. 
11. Similar effects are noticeable in cast iron and in cobalt. The 
“ sensitive state ” is absent, or is present to only a very slight extent, in soft 
iron. 
12. The effect has a maximum value for fields which give large values 
of jul, and tends to zero as the saturation point is approached. 
( Issued separately April 10, 1908.) 
