Letter from Henry Thomas Colebrooke to Nathaniel Wallich, pleased to hear that Wallich has resumed his role at the Botanic Gardens and thanking Wallich for his responses to Colebrooke's previous inquiries. He thanks Wallich also for sending seeds and that the plants that he sent are doing well at Kew. He asks if more can be sent. Wallich will be proposed for the Linnean Society after the Easter break and can also be proposed to the Geological Society. Colebrooke is keen to promote study on the geology of India and states information that he would like to collect. Colebrooke is pleased that Wallich is in contact with Mr Alexander of the Cape of Good Hope. He is also contemplating whether the "Gayal" would be suitable cattle for Cape of Good Hope and England and is looking into the possibility of shipping some heifers and steers. Handwritten, dated 18 March 1818, with Wallich's dating, arrived 28 July by Marchioness of Ely, answered 29 July by [Oriton]

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which he gives advice on when to send plants as the current specimens were all dead when he retrieved them from the Custom House. He writes of jealousy among the Directors of India House if plants arrive for private persons and so therefore asks Wallich to send specimens to them but to continue to send him seeds. He adds thanks for geological specimens and for Wallich to forward letters of acknowledgement to General Hardwick and Dr Adams. He asks whether the other gentlemen might be interested in joining the Geological Society. Handwritten, dated 20 January 1820, received 9 July 1820.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which Colebrooke thanks Wallich for his report on his journey to the Tipoo forests. He would be glad to see maps that Wallich has promised and the map that should have accompanied Gerard's Journal has not arrived at India House. This Journal has furnished a paper for the Transactions of the Royal Asiatic Society. He has yet to see Wallich's Tentamen Florae Nepalensis and will happily receive a copy from Wallich. He reassures Wallich concerning his reputation but adds that nothing, as yet, has happened at India House concerning appointment of an assistant. He discusses furlough and provision of publications. Handwritten, dated 21 February 1826, received 28 June 1826.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich in which he thanks Wallich for Nepal seeds and for rock specimens sent to him. He gives details of how various seeds and plants are growing in England mentioning Sir Joseph Banks and Mr Lambert. Wallich has been elected to the Linnaean and Geological Societies. Colebrooke will pay his fees if Wallich will reimburse to Colebrooke's agent. Colebrooke thanks for interesting papers that Wallich has sent including Captain Webb's account concerning the Himalayan mountains. Handwritten, dated 22 April 1819, dated in Wallich's hand, received 8 October.

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 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 describes the measures that he has taken to obtain an assistant for Wallich. He regrets the delay in Wallich receiving his publications. He remarks on geological specimens and asks Wallich to thank Capt. G. for the vocabulary of the Kunawar language and is unsure whether to deposit it in the Company's Library or that of the Royal Asiatic Society. He discusses his forestry plantations and the possibility of Wallich obtaining leave. He appends a memo concerning geological specimens. Handwritten, dated 27 July 1825, received 10 December 1825.

Letter from Henry Thomas Colebrooke to Nathaniel Wallich to ask Wallich whether he would like the earlier volumes of the Geological Transactions to complete his set as they are available at modest terms. Colebrooke and Mr Lambert have had an interview to request an assistant for Wallich but, as yet, do not know the outcome. The specimens that Wallich sent are still undistributed and therefore Colebrooke suggests that Wallich apportions them to men of science in future. In a postscript Colebrooke mentions that Richardson is still sending publications to Wallich. Handwritten, dated 30 March 1824, received 29 September 1824.

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 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.