原文 (英语)

This etext was prepared by Sue Asscher asschers@dingoblue.net.au THE VARIATION OF ANIMALS AND PLANTS UNDER DOMESTICATION BY CHARLES DARWIN, M.A., F.R.S., ETC. IN TWO VOLUMES VOLUME I. PREFACE TO THE SECOND EDITION. During the seven years which have elapsed since the publication in 1868 of the first edition of this Work, I have continued to attend to the same subjects, as far as lay in my power; and I have thus accumulated a large body of additional facts, chiefly th