XVIII. FREE FIGHT (1869-1870)
XIX. CHAOS (1870)
XX. FAILURE (1871)
XXI. TWENTY YEARS AFTER (1892)
XXII. CHICAGO (1893)
XXIII. SILENCE (1894-1898)
XXIV. INDIAN SUMMER (1898-1899)
XXV. THE DYNAMO AND THE VIRGIN (1900)
XXVI. TWILIGHT (1901)
XXVII. TEUFELSDROCKH (1901)
XXVIII. THE HEIGHT OF KNOWLEDGE (1902)
XXIX. THE ABYSS OF IGNORANCE (1902)
XXX. VIS INERTIAE (1903)
XXXI. THE GRAMMAR OF SCIENCE (1903)
XXXII. VIS NOVA (1903-1904)
XXXIII. A DYNAMIC THEORY OF HISTORY (1904)
XXXIV. A LAW OF ACCELERATION (1904)
XXXV. NUNC AGE (1905)


EDITOR'S PREFACE

THIS volume, written in 1905 as a sequel to the same author's
"Mont Saint Michel and Chartres," was privately printed, to the
number of one hundred copies, in 1906, and sent to the persons
interested, for their assent, correction, or suggestion. The idea
of the two books was thus explained at the end of Chapter XXIX:
--

"Any schoolboy could see that man as a force must be measured