evolution in
our industrial relations, I shall feel that my own and my readers'
time have not been altogether lost."

Indeed the readers' time will not be lost. This book gives an engineering,
scientific--in the meantime practical--analysis of all human problems. It is
a deep and practical treatise on all great questions concerning modern
industrialism and so-called economic problems and is a foundation for a
new scientific industrial philosophy. Another very clear outline of the
_Principles of Industrial Philosophy_ was given by Mr. Polakov in his
paper presented at the annual meeting of the American Society of
Mechanical Engineers, December 7-10, 1920. Anyone who has anything to do
with industrial or economic problems cannot afford to overlook the
important and fundamental work in this book.

It is obvious that a scientific knowledge of facts, is of the greatest
importance for anyone who cares to approach any problem in a serious way.
Statistics which are up-to-date are therefore of primary importance. I had
the privilege of reading the manuscript of _Quo Vadis America_, the
forthcoming book of Mr. Polakov, where a most valuable statistical picture
of facts in modern America is given and the astonishing conclusions which
are to be drawn therefrom. I can only regret that in Europe we have not
such a knowledge written down concerning European conditions. If more such
books had been written and _read_ by the public, many crises and
catastrophes would have been avoided.

The outstanding contribution of Mr. Robert B. Wolf to engineering was made
in his study of physiology, biology, psychology and philosophy as applied
to engineering.

"If anyone wishes to inquire into the forces which have led up to
the individual development of mankind, he will find himself at
once plunged into the realm of psychology and mental philosophy. I
can heartily recommend such a course as immensely profitable and
of practical value.

"The five important facts, however, that have to do with the
subject in hand are:

"_1st._ That the human body is such a wonderful organization
because it is the product of the forces of creation, acting
through millions of years of evolution.

"_2nd._ That its capacity for progress depends upon the
maintenance of the unity resulting from this creative evolution
and upon a conscious recognition of this unity.

"_3d._ That this unity would