The twentieth volume in a 29-volume set which contain all Charles Darwin's published works. Darwin was one of the most influential figures of the 19th century. His work remains a central subject of study in the history of ideas, the history of science, zoology, botany, geology and evolution.

Chapter XIII Inheritance continued - Reversion or Atavism; Chapter XIV Inheritance continued, - Fixedness of Character - Prepotency - Sexual Limitation - Correspondence of Age; Chapter XV On Crossing; Chapter XVI Causes Which Interfere with the Free Crossing of Varieties - Influence of Domestication on Fertility; Chapter XVII On the Good Effects of Crossing, and on the Evil Effects of Close Interbreeding; Chapter XVIII On The Advantages and Disadvantages of Changed Conditions of Life: Sterility from Various Causes; Chapter XIX Summary of the Four Last Chapters, with Remarks on Hybridism; Chapter XX Selection by Man; Chapter XXI Selection Continued; Chapter XXII Causes of Variability; Chapter XXIII Direct and Definite Action of the External Conditions of Life; Chapter XXIV Laws of Variation - use and Disuse, Etc.; Chapter XXV Laws of Variation continued - Correlated Variability; Chapter XXVI Laws of Variation continued - Summary; Chapter XXVII Provisional Hypothesis of Pangenesis; Chapter XXVIII Concluding Remarks;

Paul H. Barrett, R. B. Freeman, Peter Gautrey