Chicago, London, Open Court Publ. Company, Kegan Paul, Trench, Trübner & Co., 1905. Orig. full cloth. Titlelabel in leather with gilt lettering. A few faint spots to frontcover. XVIII,847 pp.´+ Publisher's Cat. (6) pp. Clean and fine.
First edition of the English version of De Vries " Theory of mutation" given as 28 lectures at the University of California in 1904. "A perusal of the Lectures will show that the subject matter of "Die Mutationstheorie" (this work was translated in full into English in 1909-10) has been presented in a somewhat condensed form, and that the time which has elapsed since the original was prepared has given the oppurtunity for the acquisition of additional facts, and a re-examination of some of the more importent conclusions with the result that a notable gain has been made in the treatment of some complicated problems." (Editors Foreword). - "New experiments and observations have been added, and a wider choice of the material offered by the more recent current literature has been made in the interest of a clear representation of the leading ideas..."(Author's Preface).