and criticized, with great practical
results.

To all those who have read and criticized the manuscript or helped
otherwise--Professors E. H. Moore, C. J. Keyser, J. H. Robinson, Burges
Johnson, E. A. Ross, A. Petrunkevitch; and Doctors J. Grove-Korski,
Charles P. Steinmetz, J. P. Warbasse; Robert B. Wolf, Vice-President of
the American Society of Mechanical Engineers; Champlain L. Riley,
Vice-President of the American Society of Heating and Ventilating
Engineers; Miss Josephine Osborn; to the authors, L. Brandeis, E. G.
Conklin, C. J. Keyser, J. Loeb, E. S. Mead, H. O'Higgins, W. Polakov, J.
H. Robinson, R. B. Wolf, for their kind permission to quote them, I wish
to express my sincere appreciation.

I wish also to acknowledge the deepest gratitude to my wife, formerly Mira
Edgerly, who has found in this discovery of the natural law for the human
class of life, the solution of her life long search, and who, because of
her interest in my work, has given me incomparably inspiring help and
valuable criticism. It is not an exaggeration to state that except for her
steady and relentless work and _her time, which saved my time_, this book
could not have been produced in such a comparatively short time.

Mr. Walter Polakov of New York City, Industrial Counsellor and Industrial
Engineer in New York City, has kindly consented at my request to act, with
my authority, as my representative to whom any further queries should be
addressed in my absence from America.

To all other friends who have helped in many personal ways I express
thankfulness, as I wish also to thank John Macrae, Esq., the
Vice-President of E. P. Dutton & Co., for his unusual attitude toward
publishing the book.

A. K.
_January 17, 1921_
_New York City._

Chapter I. Introduction. Method and Processes of Approach to a New Concept
of Life

"For a while he trampled with impunity on laws human and divine
but, as he was obsessed with the delusion that two and two makes
five, he fell, at last a victim to the relentless rules of humble
Arithmetic.

"Remember, O stranger, Arithmetic is the first of the sciences and
the mother of safety."

BRANDEIS.

It is the aim of this little book to point the way to a new science and
art--the science and art of Human Engineering. By Human Engineering I mean
the science and art of directing the energies and capacities of human
beings to the advancement of human weal. It need not be