I have read the book of Upton Sinclair with great interest and am
convinced that the same deserves the most earnest consideration, not
only of the laity, but also of the psychologists by profession. The
results of the telepathic experiments carefully and plainly set forth in
this book stand surely far beyond those which a nature investigator
holds to be thinkable. On the other hand, it is out of the question in
the case of so conscientious an observer and writer as Upton Sinclair
that he is carrying on a conscious deception of the reading world; his
good faith and dependability are not to be doubted. So if somehow the
facts here set forth rest not upon telepathy, but upon some unconscious
hypnotic influence from person to person, this also would be of high
psychological interest. In no case should the psychologically interested
circles pass over this book heedlessly.
[signed] A. EINSTEIN
_May 23, 1930_