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.

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.

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".

Rejects Smith's proposal to give Brown's name to Brown's genus 'Josephia'; explains how he previously considered 'Dryandra' and others. Sends Smith two 'Orchidaceae' to be considered instead and suggests 'B. tropica' or 'B. sencea' for one and 'B. australis' for the other, observations on second and third pages [crossed through in pencil]. Urges a swift "baptizm" if acceptable to Smith so as to include them in the "Prodromus" he is currently working on. Suggests an appendment to Smith's "Lapland tour", currently in the press, in the form of an essay on its botany by [Georg] Wahlenberg. [Alexander] Macleay has fractured the fibula of his right leg. An essay on 'Proteaceae' by "Knight & co." [Richard Salisbury published Brown's 'Proteacea' under the name of Joseph Knight (c 1777-1855), gardener for George Hibbert (1757-1837, merchant), see RelatedMaterial].

Arrangements for visiting Smith. Criticises the writing of Dr [Walter ?] Wade and Mr Schmaltz [possibly Constantino Samuel Rafinesque-Schmaltz], particularly the latter's work on 'Verbena nodiflora'. First meeting of the Linnean Club taking place today.