Account of the four-month voyage to Tierra del Fuego, Cape Horn, and return. The Fuegians are landed with Richard Matthews [the missionary in charge of them]. Storms, seasickness, hostile savages, and scenery are described. His increasing interest in all branches of natural history makes the hardships worth while. FitzRoy buys a schooner. CD will stay at Rio Negro while it is fitted.

Longs to be on the other side of the Horn; tired of these countries. Natural history makes him continue. He now knows it will remain his favourite pursuit for the rest of his life.

Comments on slavery.

Will have additional space on board and a servant [Syms Covington] who will help him with the collection of birds and quadrupeds.

Asks for books, a lens, and four pairs of shoes.

With the help of General Rosas, CD has just finished an overland journey from Patagones to Buenos Aires; he tells of fossil finds at Bahia Blanca and Guardia del Monte. Spring reminds him of home.

Describes his trip to north of Santa Fé, his illness, and return by boat to Buenos Aires – which he found in the throes of a revolution. Covington is cut off from the town, which some expect to be plundered.

His troubles during the revolution have ended well.

Now plans to investigate geological formations at Rio Negro. Is concerned about the expense but cannot bear to miss seeing "one of the most curious pieces of Geology".

Has had to draw bills totalling £217 in seven months.

Is glad the Captain has decided to winter in Tierra del Fuego, because this will facilitate "glorious excursions" into the Andes.

Has obtained fragments of fossil bones and part of a Megatherium head.

Their long delay occurred because the charts were not complete for sending home.

CD is now on shore because of seasickness.

The family may not hear from him for a year.