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.