*< Mental Evolution in Animals” 67 
case is true if the Charles-Darwinian selection from for- 
tuitous variations is intended, but it does not hold good if 
the selection is supposed to be made from variations under 
which there lies a general principle of wide and abiding 
application. It is not likely that a man of Mr. Romanes’ 
antecedents should not be perfectly awake to considera- 
tions so obvious as the foregoing, and I am afraid I am 
inclined to consider his whole suggestion as only an attempt 
upon the part of the wearer of Mr. Darwin’s mantle to 
carry on Mr. Darwin’s work in Mr. Darwin’s spirit. 
I have seen Professor Hering’s theory adopted recently 
more unreservedly by Dr. Creighton in his “ Illustrations 
of Unconscious Memory in Disease.’”’* Dr. Creighton 
avowedly bases his system on Professor Hering’s address, 
and endorses it ; it is with much pleasure that I have seen 
him lend the weight of his authority to the theory that 
each cell and organ has an individual memory. In “ Life 
and Habit ”’ I expressed a hope that the opinions it upheld 
would be found useful by medical men, and am therefore 
the more glad to see that this has proved to be the case. 
I may perhaps be pardoned if I quote the passage in “ Life 
and Habit ” to which I am referring. It runs :— 
“ Mutatis mutandis, the above would seem to hold as 
truly about medicine as about politics. We cannot reason 
with our cells, for they know so much more ” (of course I 
mean “about their own business ”’) ‘‘ than we do, that 
they cannot understand us ;—but though we cannot reason 
with them, we can find out what they have been most. 
accustomed to, and what, therefore, they are most likely 
to expect ; we can see that they get this as far as it is in 
our power to give it them, and may then generally leave the 
rest to them, only bearing in mind that they will rebel 
equally against too sudden a change of treatment and no 
change at all ” (p. 305). . 
Dr. Creighton insists chiefly on the importance of change, 
* London, H. K. Lewis, 1886. 
