Letter from Henry Thomas Colebrooke to "My dear Lord". Acting in his role of President of the Asiatick Society (role held from 1806--1815) he was requesting that the Lord, as Patron, would act to enable Dr Wallich, keeper of the Society's museum to continue at the Presidency rather than be sent to his recent appointment at an outstation. Handwritten, dated 19 October 1814 from Calcutta. Appended to this letter is a copy of a note written by Wallich about his debt to Colebrooke in obtaining his position at the Calcutta Garden. Handwritten, dated 15 October [1820]. This has further handwritten annotation stating that "The following... Extract from letter of Dr Wallich to Dawson Turner and is in the handwriting of the latter."

Letter from Henry Thomas Colebrooke to Nathaniel Wallich asking for him to supply botanical information in order for him to complete a publication on Indian plants. The letter includes a list of the information that he needs. He also asks for information about certain teak plantations. Handwritten, dated April 1817 from Albany London, with mention of Lord Castlereagh, 4 September in Wallich's hand (Boat on which the letter arrived).

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which he discusses the possibility of the introduction of rice to England. Colebrooke thanks for letters, boxes of specimens and anthropological drawings. Colebrooke asks Wallich to express his thanks to the gentlemen that provided geological specimens. Colebrooke has petitioned the Chair of the Court of Directors, East India Company on Wallich's behalf. He wishes Wallich a speedy recovery to health. Handwritten, dated 8 August 1820, received 25 February 1821.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich regarding providing an annual supply of seeds for his plantations in the Cape. He lists varieties that he would particularly like Wallich to send and asks that they be directed to James Gosling Esq., at the Cape of Good Hope. Handwritten from Cape Town, dated 10 April 1822.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich concerning different species of plants that Colebrooke thinks might be appropriate to grow in his South African plantations. Handwritten, dated 22 April 1822.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which Colebrooke thanks Wallich for his reports on timber forests. He is pleased that Wallich continues to send specimens to India House and distribution is now less of a problem. He thanks Wallich for seeds which he has given to Mr Lambert. He also wishes to express his thanks to Wallich and Mr Hodgson for their present to the Royal Asiatic Society which when it arrives will be presented. He also asks whether Mr Hodgson would like to be proposed as a member of the Royal Asiatic Society. He discusses bills that Wallich has sent and closes with the news that Wallich's Lady is in town and Colebrooke hopes to call on her soon. Handwritten, dated 30 May 1826, received 17 January 1827.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich concerning the Botanic Library. The East India Company Court of Directors have agrees £200 annually for 10 years for the purchase of books old and new. Thus he will ask Richardson to send certain publications at Colebrooke's discretion until he hears from Wallich. He writes of the cost of certain books that he has already sent and discusses other possible volumes. Handwritten, dated 22 September 1821, received 21 March 1822.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich concerning Wallich's concern on sending specimens to India House and publications to be sent to Wallich from Richardson. There is a postscript in which Colebrooke reports that Law desires to be remembered to Wallich, that the plants have been given to the Horticultural Society and the seeds given to the Court of Directors to distribute among their friends, However, generally, Indian seeds do not germinate in England. Handwritten, dated 6 November 1823, received 31 May 1824.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which he writes concerning the high cost of importing specimens. He therefore asks that they are no longer sent to him individually but to send seeds to other sources who have requested them and geological specimens direct to the Geological Society. Mr Scott, Dr Jack and Lt Gerard have all been made members of the Geological Society. Handwritten, dated 22 February 1821, received 14 July 1821.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which Colebrooke is pleased that Wallich has now recovered from illness. He reports that the Nepal seeds have arrived and he has distributed them. He will get Mr Richardson to send further publications that Wallich has requested. He writes about Wallich's additions to Flora and other Supplementary papers that he has sent to Colebrooke. Colebrooke has circulated these to other botanists. Handwritten, dated 14 June 1823, received 6 October 1823.