Leave Dorjiling for Calcutta -- Jung Bahadoor -- Dr. Falconer -- Improvements in Botanic Gardens -- Palmetum -- Victoria -- _Amherstia_ -- Orchids spread by seed -- Banyan -- _Cycas_ -- Importation of American plants in ice -- Return to Dorjiling -- Leave with Dr. Thomson for the Khasia mountains -- Mahanuddy river -- Vegetation of banks -- Maldah -- Alligators -- Rampore-Bauleah -- Climate of Ganges -- Pubna -- Jummul river -- Altered course of Burrampooter and Megna -- Dacca -- Conch shells -- Saws -- Cotton muslins -- Fruit -- Vegetation -- Elevation -- Rose of Bengal -- Burrampooter -- Delta of Soormah river -- Jheels -- Soil -- Vegetation -- Navigation -- Mosquitos -- Atmospheric pressure -- Effects of geological changes -- Imbedding of plants -- Teelas or islets -- Chattuc -- Salubrious climate -- Rains -- Canoes -- Pundua -- Mr. Harry Inglis -- Terrya Ghat -- Ascent to Churra -- Scenery and vegetation at foot of mountains -- Cascades. I was chiefly occupied during January and February of 1850, in arranging and transmitting my collections to Calcutta, and completing my manuscripts, maps, and surveys. My friend Dr. Thomson having joined me here, for the purpose of our spending a year in travelling and botanising together, it became necessary to decide on the best field for our pursuits. Bhotan offered the most novelty, but it was inaccessible to Europeans; and we therefore turned our thoughts to Nepal, and failing that, to the Khasia mountains. The better to expedite our arrangements, I made a trip to Calcutta in March, where I expected to meet both Lord Dalhousie, on his return from the Straits of Malacca, and Jung Bahadoor (the Nepalese minister), who was then _en route_ as envoy to England. I staid at Government House, where every assistance was afforded me towards obtaining the Nepal Rajah's permission to proceed through the Himalaya from Dorjiling to Katmandu. Jung Bahadoor received me with much courtesy, and expressed his great desire to serve me; but begged me to wait until his return from England, as he could not be answerable for my personal safety when travelling during his absence; and he REferred to the permission he had formerly given me (and such was never before accorded to any European) in earnest of his disposition, which was unaltered. We therefore determined upon spending the season of 1850 in the Khasia mountains in eastern Bengal, at the head of the great delta of the Ganges and Burrampooter. Illustration--DR. FALCONER'S RESIDENCE, CALCUTTA BOTANIC GARDENS, FROM SIR L. PEEL'S GROUNDS.