sly re-published. There are seven of
them; namely--"Morals and Moral Sentiments," "The Factors of Organic
Evolution," "Professor Green's Explanations," "The Ethics of Kant,"
"Absolute Political Ethics," "From Freedom to Bondage," and "The
Americans." As well as these large additions there are small additions,
in the shape of postscripts to various essays--one to "The Constitution
of the Sun," one to "The Philosophy of Style," one to "Railway Morals,"
one to "Prison Ethics," and one to "The Origin and Function of Music:"
which last is about equal in length to the original essay. Changes have
been made in many of the essays: in some cases by omitting passages and
in other cases by including new ones. Especially the essay on "The
Nebular Hypothesis" may be named as one which, though unchanged in
essentials, has been much altered by additions and subtractions, and by
bringing its statements up to date; so that it has been in large measure
re-cast. Beyond these respects in which this final edition differs from
preceding editions, it differs in having undergone a verification of its
references and quotations, as well as a second verbal revision.

Naturally the fusion of three separate series of essays into one series,
has made needful a general re-arrangement. Whether to follow the order
of time or the order of subjects was a question which presented itself;
and, as neither alternative promised satisfactory results, I eventually
decided to compromise--to follow partly the one order and partly the
other. The first volume is made up of essays in which the idea of
evolution, general or special, is dominant. In the second volume essays
dealing with philosophical questions, with abstract and concrete
science, and with aesthetics, are brought together; but though all of
them are tacitly evolutionary, their evolutionism is an incidental
rather than a necessary trait. The ethical, political, and social essays
composing the third volume, though mostly written from the evolution
point of view, have for their more immediate purposes the enunciation of
doctrines which are directly practical in their bearings. Meanwhile,
within each volume the essays are arranged in order of time: not indeed
strictly, but so far as consists with the requirements of sub-classing.

Beyond the essays included in these three volumes, there remain several
which I have not thought it well to include--in some cases because of
their personal character, in other c