ases because of their relative
unimportance, and in yet other cases because they would scarcely be
understood in the absence of the arguments to which they are replies.
But for the convenience of any who may wish to find them, I append their
titles and places of publication. These are as follows:--"Retrogressive
Religion," in _The Nineteenth Century_ for July 1884; "Last Words about
Agnosticism and the Religion of Humanity," in _The Nineteenth Century_
for November 1884; a note to Prof. Cairns' Critique on the _Study of
Sociology_, in _The Fortnightly Review_, for February 1875; "A Short
Rejoinder" [to Mr. J. F. McLennan], _Fortnightly Review_, June 1877;
"Prof. Goldwin Smith as a Critic," _Contemporary Review_, March 1882; "A
Rejoinder to M. de Laveleye," _Contemporary Review_, April 1885.

LONDON, _December, 1890_.

CONTENTS OF VOL. I.

PAGE

THE DEVELOPMENT HYPOTHESIS 1

PROGRESS: ITS LAW AND CAUSE 8

TRANSCENDENTAL PHYSIOLOGY 63

THE NEBULAR HYPOTHESIS 108

ILLOGICAL GEOLOGY 192

BAIN ON THE EMOTIONS AND THE WILL 241

THE SOCIAL ORGANISM 265

THE ORIGIN OF ANIMAL WORSHIP 308

MORALS AND MORAL SENTIMENTS 331

THE COMPARATIVE PSYCHOLOGY OF MAN 351

MR. MARTINEAU ON EVOLUTION 371

THE FACTORS OF ORGANIC EVOLUTION 389

(_For Index, see Volume III._)

THE DEVELOPMENT HYPOTHESIS.

[_Originally published in _The Leader, _for March 20,_ 1852. _Brief
though it is, I place this essay before the rest, partly because
with the exception of a similarly-brief essay on "Use and Beauty",
it came first in order of time, but chiefly because it came first in
order of thought, and struck the keynote of all that was to
follow._]

In a debate upon the development hypothesis, lately narrated to me by a
friend, one of the disputants was described as arguing that as, in all
our experience, we know no such phenomenon