anic Islands.

1843.

Working at "Volcanic Islands" and "some Species work."

1844.

February 13th: Finished "Volcanic Islands."

July to September: Wrote an enlarged version of Species Theory. Papers
on Sagitta, and on Planaria.

July 27th: Began his book on the Geology of South America.

1845.

Paper on the Analogy of the Structure of Volcanic Rocks with that of
Glaciers. "Proc. R. Soc. Edin."

April 25th to August 25th: Working at second edition of "Naturalist's
Voyage."

1846.

October 1st: Finished last proof of "Geological Observations on South
America." Papers on Atlantic Dust, and on Geology of Falkland Islands,
communicated to the Geological Society. Paper on Arthrobalanus.

1847.

Working at Cirripedes. Review of Waterhouse's "Natural History of the
Mammalia."

1848.

March 20th: Finished Scientific Instructions in Geology for the
Admiralty Manual. Working at Cirripedes. Paper on Erratic Boulders.

1849.

Health especially bad. Working at Cirripedes.

March-June: Water-cure at Malvern.

1850.

Working at Cirripedes. Published Monographs of Recent and Fossil
Lepadidae.

1852.

Working at Cirripedes.

1853.

November 30th: "Royal Medal given to me."

1854.

Published Monographs on Recent and on Fossil Balanidae and Verrucidae.

September 9th: Finished packing up all my Cirripedes. "Began sorting
notes for Species Theory."

1855.

March-April: Experiments on the effect of salt water on seeds. Papers on
Icebergs and on Vitality of Seeds.

1856.

May 14th: "Began, by Lyell's advice, writing Species Sketch" (described
in "Life and Letters" as the "Unfinished Book").

December 16th: Finished Chapter III. Paper read to Linnean Society, On
Sea-water and the Germination of Seeds.

1857.

September 29th: Finished Chapters VII. and VIII.

September 30th to December 29th: Working on Hybridism. Paper on the
Agency of Bees in the Fertilisation of Papilionaceous Flowers.

1858.

March 9th: "Finished Instinct chapter."

June 18th: Received Mr. Wallace's sketch of his evolutionary theory.

July 1st: Joint paper of Darwin and Wallace read at the Linnean Society.

July 20th to July 27th: "Began Abstract of Species book," i.e., the
"Origin of Species," at Sandown, I.W. Paper on Bees and Fertilisation of
Flowers.

1859.

May 25th: Began proof-sheets of the "Origin of Species."

November 24th: Publication of the "Origin": 1250 copies printed.

October 2nd to December