Letter from Henry Thomas Colebrooke to Nathaniel Wallich acknowledging letters sent and stating that he has sorted Wallich's remittances and arranged for the periodicals he requests to be sent to him. He was pleased with the geological specimens sent to him, including gold from Tartary and specimens from Lieutenant Gerard and Mr Scott and Colebrooke has used the notes sent by Gerard to write a paper on the geology of the valley of the Sutlej. He has proposed Lt Gerard and Dr Jack as members of the Geological Society. He thanks Wallich for seeds sent but advises because of the cost to be careful in thinking through which to send. Handwritten, dated 9 January 1821, received 5 June 1821.

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 concerning publications that Colebrooke will forward to Wallich. He reiterates his request to send specimens direct to the Geological Society because of the cost incurred at the Custom House. Handwritten, dated 12 March 1821, received 30 August 1821.

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 in which he confirms the remittance for the Botanic Library by the East India Company Court of Directors. Colebrooke is on board boat headed for the Cape where he will stay a short time before returning to Europe. Dated 18 December 1821, received 24 March 1822.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich from Cape of Good Hope. Colebrooke has been more concerned with matters to do with his landed property than with botanical matters but has gathered some geological specimens. He requests that Wallich send seeds to the Cape to James Gosling, that he thinks might be profitable for the region. Handwritten, dated 12 March 1822.

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 he congratulates Wallich for his success in research in Nepal. Colebrooke discusses publications to send to Wallich. He again reiterates the need to send specimens directly to such institutions as the Linnaean and Geological Societies rather than to him personally. Handwritten, dated 31 July 1822, received 1 February 1823.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which Colebrooke discusses the periodicals that are being sent and how much the remittance will cover. He writes that he has just learnt, with regret of the death of Dr Jack. Handwritten, dated 8 January 1823, received 17 June, 1823.