Has written a book on elementary harmony and would like to send it to JH for his views on its worth.

Had no idea that JH had written on sound. Sends him an abstract of his book on harmony. Explains various aspects of chords and their notation.

Has sent him the abstract on harmony. Further remarks on this.

Regrets he has kept his theory on harmony so long; returns it and comments on various aspects.

Is grateful for his comments on his book on harmony. Explains one of his theories more fully.

Would like to dedicate his 'Elements of musical science' to JH.

Is grateful for being allowed to dedicate his book to JH; also for his information on harmonics.

Would like his opinion on the form to be adopted for the dedication.

His book on musical science is ready and a copy will be forwarded to him later when published.

Acknowledges his letter and his invitation to Collingwood. Was pleased to have the company of the young ladies on their journey from Paris.

Confined by accident but is grateful for his paper on musical scales and offers his comments on it.

Further comments on JH's paper on the musical scales.

JDH writes to Robert Brown about places he has botanised during the [Antarctica] expedition. Mentions Madeira & Tenerife briefly. Describes St Jago flora as tropical vegetation in oases on sandy plains. Notes the Palma Christi bushes, a Anasnaceae[?], European vegetation in the Valley of San Domingo, a Lotus Campanala asphidium & an interesting Umbeliferous plant probably also in Christian Smith's collections. Arrived at Christmas Harbour, Kerguelen's Land in winter, 12 May [1840]. Describes the island, climate & the distribution of flora, noting: a water plant of genus Chara, Conferva, mosses, marsh grass sp. of Juncus, Halorageaceae & Portulacea. Also details distribution of fungi, lichens, Jungermannia, Musci, Filices, Graminea, Compositae, Portulacae, Umbellifera, Rubiaceae, Rosaceae, Caryophylleae, Ranunculaceae & an unknown Bulliarda. All plants are very hardy in the snow. Letter continues dated 28 Nov 1842 addressed from HMS 'Erebus', Berkeley Sound, East Falklands. JDH explains that the letter has been unfinished for 2 years as he was disappointed in the St Helena collections to go with it. He fears his 'out of season' collections from the Kerguelen, Auckland & Hermite Islands are inferior to those of King's ship, Darwin, D' Urville & Cook's naturalist Anderson. Sir John Franklin & Gunn asked after Brown. In Van Diemen's Land [Tasmania] & New Zealand JDH collected orchids for Brown incl. a Freycinetia. Discusses: Kerguelen Cabbage, Chilean Misidendron[?] from Hermite Island, British Museum plants from Macquarie & Royal Company's Islands. Describes geology of Emerald Island. Will send Brown Falklands plants. Expedition goes south to the ice then to Cape of Good Hope & Rio de Janeiro. JDH intends to focus on Cryptogammia. Mentions classification of Gunnera, article on fossil wood in TASMANIAN JOURNAL, the Macleay's garden & the loss of Menzies. Colenso will send Brown NZ fossil woods. Thanks Brown for proposing him at the Linnean Society & Athenaeum.

Declines offer of Secretaryship of the Linnean Society and explains his decision. Pleased that Smith's health has improved and his progress with the third volume of "The English Flora". Sending Smith his appendix to "Captain Parry's 1st Voyage" and his contribution to the botanical appendix of "Captain Franklin's journey". Pleased that Smith is to adopt Brown's proposals for 'Cruciferae', and comments on [Augustin Pyramus] de Candolle's work on the same.

Accepts his prospective appointment [as vice-president of Linnean Society] with some trepidation. Glad to hear of the additions of 'Woodia' and 'Ophrys' to "The English Flora" which are new to him, had previously heard of the 'Isnardia' from others. Still unsatisfied with 'Aspidium' and 'Nephrodium'. Currently engaged in examining particles of "faville".

Frustrated in giving a full account of of his New Holland [Australia] desiderata, Smith's labours in this area have facilitated his researches but still unsure on some specimens, in particular 'Eucalyptus'. Relates the misfortunes of [Matthew Flinder's] expedition to Australia [on which Brown was the naturalist] but despite these and the failure to complete the planned survey approximately 3000 species have been brought home, Brown hopes at least a third are new. [Ferdinand] Bauer has made approximately 1600 drawings. Appointed Librarian of the Linnean Society. Pleased to hear that Smith is recovering from his "severe indisposition".

Linnean Society currently depends entirely upon Smith for papers, short for ninth volume of "Linnean Transactions". Intends to offer an essay on 'Holoraceae' including 'Amaranthaceae' and 'Atriplius', which has been neglected by botanists but Brown has examined most of it in determining his New Holland [Australia] plants. Sends list of species from Linnaeus herbarium Brown would like to inspect: 'Achyranthes muricata', 'Achyranthes alternifolia', 'Achyranthes alternifolia', 'Celosia argentea', 'Celosia margaritacea', 'Celosia gnaphaloides', 'Illecebrum brachiatum', 'Illecebrum sanguinolentum', 'Illecebrum canariense', 'Illecebrum bengalense', 'Illecebrum polygonoides', 'Illecebrum precordium', 'Illecebrum cymosum', 'Illecebrum alsinifolium', 'Illecebrum suffruticosum', 'Gomphrena arborescens', 'Corispermum squarrosum', 'Camphorosma monspeliaca', 'Camphorosma actua', 'Camphorosma glabra', 'Camphorosma paleacea', 'Salsola rosacea', 'Salsola sativa', 'Salsola polyclonos', and 'Salsola hirsuta' [list of plants is marked in pencil in Smith's hand with either a tick or cross, note in Smith's hand "plants lent and returned"]

Has been suffering from persistent ailments. Observations on Smith's two species of 'Brodiaea' in [Sir Joseph] Banks' herbarium, compares 'Brodiaea congesta' with work of [Archibald] Menzies and [Richard] Salisbury. Observations on capsules of 'Acrostichum digitatum'. At the request of [Jonas] Dryander arranging his 'Protaceae', with view to publication in "Linnean Transactions", queries Smith on 'Protea' in Linnaeus' herbarium: 'Protea cyanoides', 'Protea phylicoides', 'Protea sphaerocephala', 'Protea racemosa', 'Protea spicata', 'Protea strobilina', 'Protea sencea', 'Protea hirta', and 'Protea obliqua'.

Questions for Smith on papers he wrote on New Holland [Australian] plants in ninth volume of "Linnean Transactions". Believes 'Conchium congifolium' is the same as 'Conchium pugioniforme', opinions on 'Conchium sphaeroideum' and 'Conchium compressum'. Believes Smith's 'Gompholobium maculatum', described under 'Gompholobium scabrum', is a distinct species as comprehended under Linnaeus's 'Sophora genistoides'. Believes 'Bossiaea ovata' may be 'Bossiaea heterophylla'. Questions appropriateness of 'Scolopendrium' as a name. Thanks Smith for answers his on 'Protea', his developments, has finished his paper on the subject. Comments on paucity of botanical matters in other journals. Remarks on a paper read by [David] White on the Malabar 'Cardamom' which Brown believes proves it is a distinct genus, at least by [William] Roscoe's principles.

Discusses his paper on 'Proteaceae' and reasons for keeping the name 'Hakea' instead of Smith's apparent suggestion of 'Conchium'. This was in deference to [Baron Christian Ludwig von] Hake, and previous use by [Heinrich] Schrader, [Antonio José] Cavanilles, [Jacques] La Billardiere and [Etienne Pierre] Ventenat, and being pushed by [Jonas] Dryander having used it in his catalogue of New Holland [Australian] plants and the strong likelihood of it being used in "Hortus Kewensis".