Leave Lachoong for Tunkra pass -- Moraines and their vegetation -- Pines of great dimensions -- Wild currants -- Glaciers -- Summit of pass -- Elevation -- Views -- Plants -- Winds -- Choombi district -- Lacheepia rock -- Extreme cold -- Kinchinjunga -- Himalayan grouse -- Meteorological observations -- Return to Lachoong -- Oaks -- Ascend to Yeumtong -- Flats and debacles -- Buried pine-trunks -- Perpetual snow -- Hot springs -- Behaviour of Singtam Soubah -- Leave for Momay Samdong -- Upper limit of trees -- Distribution of plants -- Glacial terraces, etc. -- Forked Donkia -- Moutonneed rocks -- Ascent to Donkia pass -- Vegetation -- Scenery -- Lakes -- Tibet -- Bhomtso -- Arun river -- Kiang-lah mountains -- Yaru-Tsampu river -- Appearance of Tibet -- Kambajong -- Jigatzi -- Kinchinjhow, and Kinchinjunga -- Chola range -- Deceptive appearance of distant landscape -- Perpetual snow -- Granite -- Temperatures -- Pulses -- Plants -- Tripe de roche -- Return to Momay -- Dogs and yaks -- Birds -- Insects -- Quadrupeds -- Hot springs -- Marmots -- Kinchinjhow glacier. CHAPTER XXIII. Donkia glaciers -- Moraines -- Dome of ice -- Honey-combed surface -- Rocks of Donkia -- Metamorphic action of granite veins -- Accident to instruments -- Sebolah pass -- Bees and May-flies -- View -- Temperature -- Pulses of party -- Lamas and travellers at Momay -- Weather and climate -- Dr. Campbell leaves Dorjiling for Sikkim -- Leave Momay -- Yeumtong -- Lachoong -- Retardation of vegetation at low elevations -- Choongtam -- Landslips and debacle -- Meet Dr. Campbell -- Motives for his journey -- Second visit to Lachen valley -- Autumnal tints -- Red currants -- Lachen Phipun -- Tungu -- Scenery -- Animals -- Poisonous rhododendrons -- Fire-wood -- Palung -- Elevations -- Sitong -- Kongra Lama -- Tibetans -- Enter Tibet -- Desolate scenery -- Plants -- Animals -- Geology -- Cholamoo lakes -- Antelopes -- Return to Yeumtso -- Dr. Campbell lost -- Extreme cold -- Headaches -- Tibetan Dingpun and guard -- Arms and accoutrements -- Temperature of Yeumtso -- Migratory birds -- Visit of Dingpun -- Yeumtso lakes. CHAPTER XXIV.