The march was very tiresome, some of the ranges passed were high and well clothed with firs.  Those marked thus* are subtropical or tropical, and one glance will show their predominance:  only Corydalis straggles down.  The woods were in many places damp, in others dry:  it was obvious that less rain had fallen between Chupcha and Chuka, than in other situations:  a large proportion of Laurineae and Acanthaceae appeared in the woods, with Gordonia:  the oaks and chesnuts when they did present themselves bore a tropical form, pointed out by their coriaceous undivided or merely serrated leaves.  I certainly never saw such a predominance of tropical forms, at such an elevation as 3,500 or 4,000 feet.

For Lyellia I had been hunting for three years, but never thought of looking for it at low elevations; as it was I believe given out to be a native of high places.  Of birds, Bucco, Picus intermedius, green pigeon, azure shrikelet, occurred.

May 17th.—­Murichom is a small village of eight or nine thatched houses, it is well and prettily situated:  about it maize and wheat are in cultivation, Ficus, Hoya, Dendrobium, Croton malvaefolius, Meliacea, Cedrela Toona, orange, Verbesina, Datura, Artemisia major, Echites, in fact it would be difficult to point out an elevational plant.  The same remark applies to the march to Gygoogoo, distant twelve miles, and situated 500 feet below the road, but still it is about the same level as Murichom.  The march commenced with a steep descent, followed by a steeper ascent, then winding along, in and out, at an average elevation of 5,000 feet.  The road was very bad, rocky and rugged as usual, P. and B. passed the village, and pushed on to Buxa, a distance of twenty miles, which place they reached at 7 P.M.  At Murichom, Ficus cordata, fructibus pyriformibus, Clerodendron infortunata, Adamia, Spilanthes, Melastoma malabathrica, Bignonia, Pentaptera.  The Oollook or Simia Hylobates, of Upper Assam.

Scarcely any thing worth noticing occurred; the vegetation being precisely the same.  No oaks or chesnuts, at least comparatively few:  Elaeocarpus, Rhus, Gordonia are the most common trees; Pythonium common, Hoya rotundifolia.  Gygoogoo, a small village of two or three houses, was passed.

May 18th.—­Marched to Buxa, ascending from Gygoogoo over a wretched rocky road, winding in and out.  No water was to be had until we reached a ridge from which to Buxa is one continued descent.  This ridge is between 5 and 6,000 feet, and yet there is scarcely a change in the vegetation.  Pythonium abounded, especially P. majus, which literally occurred in profusion.  The trees towards the top of the ridge were covered with moss, but all appeared subtropical; a few chesnuts, E. spinosissima occurred, Bambusa nodosis, verticillatis, and spinosis.