permission to use the essay "Marriage as a Psychological
Relationship", which first appeared in English in Keyserling
Book of Marriage. The translation of this essay is our own,
having been completed before the publication of the Book of
Marriage. Further acknowledgment is due to Prince Rohan,
editor of the Europäische Revue, for the privilege of using the
article Die Frau in Europa" (Woman in Europe). We must
also thank Mrs Beatrice Ensor who on behalf of the Inter-
national Congress of Education sanctioned the inclusion of the
six lectures in this volume. Of this series, the three delivered
in London are not translations, but were drafted in English
by the author and revised by Mr Roberts Aldrich.

We are very much indebted to Miss A. M. Bodkin for her
valuable help in working over the English of a number of the
papers, and to Mr. J. M. Thorburn for suggestions concerning
technical terminology in the paper "On Psychical Energy".

Readers of this volume of essays and lectures will find
pleasure in the fact that Jung has held resolutely to the task
he originally set himself when he first began his training as a
psychiatrist. He resolved at that time to make his
psychological field cover the full complexity of experience
rather than to take advantage of the tempting but illusory
simplifications of the laboratory.

H. G. BAYNES.

CARY F. BAYNES.

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