apology for having ever advocated the possibility of the transmission
of acquired characters.

"Unconscious Memory" was largely written to show the relation of
Butler's views to Hering's, and contains an exquisitely written
translation of the Address. Hering does, indeed, anticipate Butler,
and that in language far more suitable to the persuasion of the
scientific public. It contains a subsidiary hypothesis that memory
has for its mechanism special vibrations of the protoplasm, and the
acquired capacity to respond to such vibrations once felt upon their
repetition. I do not think that the theory gains anything by the
introduction of this even as a mere formal hypothesis; and there is
no evidence for its being anything more. Butler, however, gives it a
warm, nay, enthusiastic, reception in Chapter V (Introduction to
Professor Hering's lecture), and in his notes to the translation of
the Address, which bulks so large in this book, but points out that
he was "not committed to this hypothesis, though inclined to accept
it on a prima facie view." Later on, as we shall see, he attached
more importance to it.

The Hering Address is followed in "Unconscious Memory" by
translations of selected passages from Von Hartmann's "Philosophy of
the Unconscious," and annotations to explain the difference from this
personification of "The Unconscious" as a mighty all-ruling, all-
creating personality, and his own scientific recognition of the great
part played by UNCONSCIOUS PROCESSES in the region of mind and
memory.

These are the essentials of the book as a contribution to biological
philosophy. The closing chapters contain a lucid statement of