Nov. 27th.—­Descended to Yen:  near our halting place we gathered a fine Pomacea arborea in fruit:  a Symplocos, and observed Wallichioideae and Calamus.  The plants of the greatest interest gathered were an Acer, an Epilobium, a Hoya grandiflora, Eurya, Hypericum, a fine Arundo, Bucklandia:  Cotoneaster microphylla, a Sabia, Coriaria, Abelia? a rare Dipodous Orchidea of the same genus as a dwarf plant of the Cossiya Hills.  Rhododendron, scandesent Eleodendron.

The ascent for the greater part is a steep wooded ridge; the first change indicated or induced by elevation is the diminution of the size in the trees, and the frequent occurrence of a Betulus? out of flower.  Proceeding onward one comes to a ridge, the S.E. declivity of which is nearly naked, the opposite being wooded with shrubs, Viburnum, Conaria, Mespilus, Pomacea, Rhododendron, Rubiacea Serissa, Cupulifera and some Compositae occur.  Then Arbutus Vaccinium; Nardus:  Filix cano-tomentosa, Lycopodium; Dicranum atratum; one or two Hypna, a Bryum, and Neckera fusca.  Descending slightly from thence the ridge is observed to be wooded on both sides; it is at the termination of this that we halted.  The ascent is continued up a rock, and the whole of the mountain is, excepting the ravines, covered with Graminea, Cyperacea, Filix cano-tomentosa, etc. but the Ericoidea are not so fine.  The grasses of the summit are two Andropogons:  an Arundo Festucoidea, Panicum, Isachne, Nardus ceasing below, it is towards this that Crepis? and Campanula are common.

The Ceratostemmata are found towards the summit, none descend any distance, except one of Roxburgh’s; they are all generally epiphytes.  Orchidea become more common towards the halting place; beyond this I observed only two past flowering, one Habenaria, and a Malaxidea; the others are two Caelogyne, a Dipodious Orchidea, labelli ungue sigmoideo very common, a Bolbophyllum, and a few ditto epiphytes out of flower, one terrestrial Bletioidea is common in some places.  At our halting place, I observed an arborescent Araliacea, a Cissus, an Acanthacea and a Laurinea.  A little below, Pandanus occurs here and there, and attains a large size, the largest in fact I have ever seen.  Castanea occurs about half way up, it is that species with rigid compound spines to the cupula.  I gathered also a fine Geastrum, but the specimens are lost.  Bucklandia occurs extensively; it is a distinct species owing to its many flowered capitula; Sedgwickia comes into play towards Yen, where Bucklandia appears to become scarce:  a large Vitex floribus roseo-purpureis is the most conspicuous tree of all, it ceases towards the summit; Cyathea I observed only above half way.  Camellia axillaris occurs below, but I missed the Laim-planj plant.  I may here observe that almost all plants with red flowers, at least in this quarter, are acid:  the Assamese always appear to expect this, the proofs are Loranthus, Ceratostemma, and Begonia, in which red is generally a predominant colour.