To our knowledge, this is the first time that the Warmth
Course, the English translation of Dr. Steiner's Warme-Lehre:
Zweiter Naturwissenschaftlicher Kursus, has appeared other than in
type-script or ditto form. This edition has, in fact, been
retyped from poorly-transcribed carbon copies of earlier texts, and we
recognize the possibility of our having reproduced errors in
translation or meaning. This publication is intended for those with a
serious interest in the extension of modern scientific ideas about the
physical sciences, and it is hoped that minor errors will not stand in
the way of the basic text. We hope that this edition is judged as only
the first of many, and that subsequent printings will take into
account corrections which our readers may find. Time is too pressing,
and educational needs in science too great to permit much delay in
this initial publication; we hope that it may be read in the spirit in
which it was printed.