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.