Jung was intrigued from early in his career with coincidences, especially
those surprising juxtapositions that scientific rationality could not
adequately explain. He discussed these ideas with Albert Einstein before
World War I, but first used the term "synchronicity" in a 1930 lecture, in
reference to the unusual psychological insights generated from consulting
the I Ching. A long correspondence and friendship with the Nobel Prize-
winning physicist Wolfgang Pauli stimulated a final, mature statement of
Jung's thinking on synchronicity, originally published in 1952 and
reproduced here. Together with a wealth of historical and contemporary
material, this essay describes an astrological experiment Jung conducted to
test his theory. Synchronicity reveals the full extent of Jung's research
into a wide range of psychic phenomena. This paperback edition of Jung's
classic work includes a new foreword by Sonu Shamdasani, Philemon Professor
of Jung History at University College London.