JDH informs his father, William Jackson Hooker, of the progress of the expedition via Madeira & Tenerife. Describes brief trip ashore at Santa Cruz & character & vegetation of the different islands of Cape Verde: wooded St Antaois, salt plain Sal & volcanic St. Jago. Collected at Porto Praya on St Jago, has wanted to visit the island since reading Christian Smith's account & recommended Lippold go, suggests how other botanists should collect there from a base in St Domingo. Saw the rocks of St Paul from the ship & his ship mates brought him a specimen of seaweed. On the coast are birds such as boobies & noddies. A Grapsus crab that steals their eggs. Considered going across the Atlantic to Pernambuco, Brazil, where JDH could have seen Adamson, Gardner & Louder. Instead they travelled via Trinidad, JDH describes the appearance of the island & the sparse vegetation, all the trees appeared to have been destroyed by the introduction of goats, there was only grass, tufts of Cyperus & a tree fern. Describes the voyage to St Helena, which was slowed down by the inferior sister ship HMS 'Terror'. JDH spent the time working on his plants in Captain Ross' cabin, drawing sea animals; crustacea & mollusca brought up in the towing nets, & taking meteorological readings. At St Helena he gave Harvey's letter to Chief Justice Wilde who has a house on Diana's Peak, the only place Dicksonia arborea grows & he has a new Brazil Araucaria in his garden. Describes the island & vegetation: it is largely barren but there are Scotch firs, a cabbage tree, Furze, 2 Rubus[?], introduced blackberry, native raspberry, a Ruellia, barren mosses, a Scotheimia, ferns & a tree fern. JDH is disappointed with his plant collection but has done all he can, there are sets for WJH, the Admiralty, Ross & Wilmot. JDH is also keeping a journal & sketchbook. McCormick has made a geological collection for Dr Fritton. JDH is reluctant to send specimens to the Royal Society Commission on Botany. Discusses his future career as a botanist & the pros & cons of naval service for a naturalist. The thought that no other botanist will go where he has on the expedition is appealing. Also includes two enclosures: some lengthy descriptions of excursions to: the Curral in Madeira, Tenerife, Porto Praya, St Jago & St Domingo valley in the Cape Verde Islands & some journal extracts dating from Dec 1839 & Feb 1840.