54 PRESIDENT’S ADDRESS—SECTION A. 
made in an enquiry as to this portion of the subject. I ought not 
to close this address without drawing attention to the very 
fruitful field for speculation as to the relation between ether and 
matter indicated by Rowland’s experiment. Briefly, it seems to 
me to indicate that the magnetic effects produced by a current in 
an electrolyte have this analogy with the magnetic effects produced 
by Rowland’s disc—that in both cases we must imagine some 
“slip” to occur. It matters not whether the slip is produced 
between the polarised ether-enwrapped atoms of the disc, or 
whether it occurs at the boundary of atoms in the third state in 
an electrolyte, where they are directed by other means into an 
average path. This, however, is too big a subject to be dealt with 
in such a sketchy manner ; and, as I have already taken up too 
much time, I will close this address with the customary thanks 
and apologies to the members of the section. 
