how substantial was the difference between Von Hartmann and myself
in spite of some little superficial resemblance; to put forward a
suggestion as regards the physics of memory, and to meet the most
plausible objection which I have yet seen brought against "Life and
Habit."

Since writing these three books I have published nothing on the
connection between heredity and memory, except a few pages of
remarks on Mr. Romanes' "Mental Evolution in Animals" in my book,
{23a} from which I will draw whatever seems to be more properly
placed here. I have collected many facts that make my case
stronger, but am precluded from publishing them by the reflection
that it is strong enough already. I have said enough in "Life and
Habit" to satisfy any who wish to be satisfied, and those who wish
to be dissatisfied would probably fail to see the force of what I
said, no matter how long and seriously I held forth to them; I
believe, therefore, that I shall do well to keep my facts for my own
private reading and for that of my executors.

I once saw a copy of "Life and Habit" on Mr. Bogue's counter, and
was told by the very obliging shopman that a customer had just
written something in it which I might like to see. I said of course
I should like to see, and immediately taking the book read the
following--which it occurs to me that I am not justified in
publishing. What was written ran thus:-

"As a reminder of our pleasant hours on the broad Atlantic, will Mr.
-- please accept this book (which I think contains more truth, and
less evidence of it, than any other I have met with) from his friend
-- ?"