JDH recounts his excursion to Tonglo Mountain, the plants observed & the collections made. Explains that cold, wet weather made many of his servants sick & unable to work. The most hard working were his Christian servant Clemanze & the Lepchas. Describes habits of Lepchas. Tonglo is 1000ft higher than JDH has been before, this was reflected in vegetation: Iris, Unciniae, 2 Arums, 2 dwarf Panax, Anagallis, Rannunculus, Aconite, Rhubarb, Thalictrum, Convallaria, above them the dwarf Bamboo forming a little jungle, Rosa, Lonicera, Holboellea, Vacciniae, Arbutus, Currant, Rubus, Daphne & Balanophora. Describes 3 new Rhododendrons & promises drawings & plants sent via Calcutta [Kolkata]. He is very keen to get them to Kew. Also collected: a Yew, scarlet Crategus, Rosa, Pyrus, Prunus, Pyrus, 3 Berberis, Wallich's Kadsura grandiflora & an epiphytic orchid. Describes new purple Magnolia. There was no grass & few ferns, lichens & mosses: Cryptogams poor in general. Got no seeds but will return. Has temperature readings for Lindley. Describes sojourn in Lama village, he stayed in the temple & observed the priests' rituals, then ate fermented barley from a woven bamboo bowl. Mentions types of bamboo grown & many useful items made from it, which he is getting for the Kew museum. Also has samples of cloth dyed with Mungeet, indigo & Elaeocarpus. Collectors have returned from Nepal, beyond the snows, where the flora is very different despite the proximity. Most of their collection is rotten, a Frittilaria & a Primrose may survive. JDH will send more collectors, relationships with China & border powers mean he may not be able to go himself despite the efforts of his political friends: Colville, Dalhousie, Elliott & Falconer. Has Carices for Boott & fungi to draw for Berkeley. Mentions: progress on the NIGER FLORA, Rose of Jericho, news of Tussack grass, observations for Humboldt, constant rain, general features of Himalayan botany & adds the letter shld be sent to Darwin at Down.