ess, for permission to quote from "The Human Worth
of Rigorous Thinking," by C. J. Keyser.

The Rockefeller Institute for Medical Research, for permission to quote
from _The Journal of Experimental Medicine_, Vol. 27.

The New School for Social Research, for permission to quote from "An
Outline of the History of the Western European Mind," by James Harvey
Robinson.

The Engineering Magazine Company, for permission to quote from "Mastering
Power Production," by Walter N. Polakov.

PREFACE

This book is primarily a study of Man and ultimately embraces all the
great qualities and problems of Man. As a study of Man it takes into
consideration _all_ the characteristics which make Man what he is. If some
readers do note the absence of certain expressions familiar to them, it
does not mean that the author does not feel or think as many other
people--he does--and very much so; but in this book an effort has been made
to approach the problem of Man from a scientific-mathematical point of
view, and therefore great pains have been taken _not_ to use words
insufficiently defined, or words with many meanings. The author has done
his utmost to use such words as convey only the meaning intended, and in
the case of some words, such as "spiritual," there has been superadded the
word "so-called," not because the author has any belief or disbelief in
such phenomena; there is no need for _beliefs_ because some such phenomena
exist, no matter what we may think of them or by what name we call them;
but because the word "spiritual" is not scientifically defined, and every
individual understands and uses this word in a _personal_ and private way.
To be _im_personal the author has had to indicate this element by adding
"so-called." I repeat once again that this book is not a "materialistic"
or a "spiritualistic" book--it is a study of "Man" and therefore does and
_should_ include materialistic as well as spiritual phenomena because only
the complex of these phenomena constitutes the complex of Man.

The problem has not been approached from the point of view of any private
doctrine or creed, but from a mathematical, an engineering, point of view,
which is impersonal and passionless. It is obvious that to be able to
speak about the great affairs of Man, his spiritual, moral, physical,
economic, social or political status, it must first be ascertained what
Man is--what is his real nature and what are the basic laws of his nature.
I