Catfish, Algeria, 1840-1842.

Sunset, 14 January 2007.

Two types of fish, Black Sea, 1837.

Fish, c 1690.

Snow in Oxford Street, London, 1941.

'The Sword-Fish', 1785-1788.

Child with pigeons in Trafalgar Square, London, 7 December 1934.

Exotic bird and flower, 1776.

Cloud study by Luke Howard, c 1808-1811.

Sunset, 4 September 1885.

Antique urn encrusted with sea creatures, 1775-1781.

The stone courses of Smeaton's Eddystone lighthouse, c 1756.