The work was interrupted by illness until late in the autumn.
February: Read paper on Climbing Plants.
December 25th: Began again on Variation.
1866.
Continued work at "Variation under Domestication." March 1st to May 10th: At work on Edition IV.

of the "Origin." Published June (1250 copies).

Read paper on Cytisus scoparius to the Linnean Society.
December 22nd: Began the last chapter of "Variation under Domestication." 1867.
November 15th: Finished revises of "Variation under Domestication." December: Began papers on Illegitimate Unions of Dimorphic and Trimorphic Plants, and on Primula.
1868.
January 30th: Publication of "Variation under Domestication." February 4th: Began work on Man.
February 10th: New edition of "Variation under Domestication." Read papers on Illegitimate Unions of Dimorphic and Trimorphic Plants, and on Verbascum.
1869.
February 10th: "Finished fifth edition of 'Origin'; has taken me forty-six days." Edition V.published in May.
Working at the "Descent of Man." Papers on the Fertilisation of Orchids, and on the Fertilisation of Winter-flowering Plants.
1870.
Working at the "Descent of Man." Paper on the Pampas Woodpecker.
1871.
January 17th: Began the "Expression of the Emotions." February 24th: "Descent of Man" published (2500 copies).
April 27th: Finished the rough copy of "Expression." June 18th: Began Edition VI.

of "Origin." Paper on the Fertilisation of Leschenaultia.
1872.
January 10th: Finished proofs of Edition VI.

of the "Origin," and "again rewriting 'Expression.'" August 22nd: Finished last proofs of "Expression." August 23rd: Began working at Drosera.
November: "Expression" published (7000 copies, and 2000 more printed at the end of the year.) November 8th: "At Murray's sale 5267 copies sold to London booksellers." 1873.
January: Correcting the Climbing Plants paper for publication as a book.
February 3rd: At work on "Cross-fertilisation." February to September: Contributions to "Nature." June 14th: "Began Drosera again." November 20th: Began "Descent of Man," Edition II.
1874.
"Descent of Man," Edition II, in one volume, published (Preface dated September).