INN 
ON THE ELEMENT OF SYMBOLIC 
CORRELATION IN EXPRESSION.’ 
THE very use of the word expression implies a 
relationship between mind and body; for that 
which is expressed is a condition of mind, and that 
by which it is expressed is a condition of body; 
while the problem remains for both the naturalist 
and the metaphysician—By what means do move- 
ments of the body, or more widely, conditions of 
matter afford an index to conditions of the mind ? 
Expression may be said to be conveyed through 
the medium of the senses of sight and hearing. 
The other senses may be left out of consideration ; 
for flavours and odours, however far-reaching their 
effects on the percipient, have no utility whatever 
in directly determining conditions of other minds, 
and the sense of touch refers to forms and movements 
1Originally published in the Journal of Anatomy and Physiology, 
July, 1879. 
