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sent them； and most of these could not exist in the warm intervening plains。 Mr。 Darwin believes that this class of facts can be explained in the same way； for； during the greatest severity of the glacial epoch； temperate forms of plants will have extended to the confines of the tropics； and on its departure； will have retreated up these southern mountains； as well as northward to the plains and hills of Europe。 But in this case； the time elapsed； and the great change of conditions； have allowed many of these plants to become so modified that we now consider them to be distinct species。 A variety of other facts of a similar nature have led him to believe that the depression of temperature was at one time sufficient to allow a few north…temperate plants to cross the Equator （by the most elevated routes） and to reach the Antarctic regions； where they are now found。 The evidence on which this belief rests will be found in the latter part of Chapter II。 of the 〃Origin of Species〃； and； accepting it for the present as an hypothesis； it enables us to account for the presence of a flora of European type on the volcanoes of Java。
It will； however； naturally be objected that there is a wide expanse of sea between Java and the continent； which would have effectually prevented the immigration of temperate fortes of plants during the glacial epoch。 This would undoubtedly be a fatal objection； were there not abundant evidence to show that Java has been formerly connected with Asia； and that the union must have occurred at about the epoch required。 The most striking proof of such a junction is； that the great Mammalia of Java； the rhinoceros； the tiger； and the Banteng or wild ox； occur also in Siam and Burmah； and these would certainly not have been introduced by man。 The Javanese peacock and several other birds are also common to these two countries； but； in the majority of cases； the species are distinct； though closely allied； indicating that a considerable time （required for such modification） has elapsed since the separation； while it has not been so long as to cause an entire change。 Now this exactly corresponds with the time we should require since the temperate forms of plants entered Java。 These are now almost distinct species； but the changed conditions under which they are now forced to exist； and the probability of some of them having since died out on the continent of India； sufficiently accounts for the Javanese species being different。
In my more special pursuits； I had very little success upon the mountainowing； perhaps； to the excessively unpropitious weather and the shortness of my stay。 At from 7；000 to 8；000 feet elevation； I obtained one of almost lovely of the small Fruit pigeons （Ptilonopus roseicollis）； whose entire head and neck are of an exquisite rosy pink colour； contrasting finely with its otherwise blue plumage； and on the very summit； feeding on the ground among the strawberries that have been planted there； I obtained a dull…coloured thrush； with the form and habits of a starling （Turdus fumidus）。 Insects were almost entirely absent； owing no doubt to the extreme dampness； and I did not get a single butterfly the whole trip； yet I feel sure that； during the dry season； a week's residence on this mountain would well repay the collector in every department of natural history。
After my return to Toego； I endeavoured to find another locality to collect in； and removed to a coffee…plantation some miles to the north； and tried in succession higher and lower stations on the mountain； but； I never succeeded in obtaining insects in any abundance and birds were far less plentiful than on the Megamendong Mountan。 The weather now became more rainy than ever； and as the wet season seemed to have set in in earnest； I returned to Batavia； packed up and sent off my collections； and left by steamer on November 1st for Banca and Sumatra。
CHAPTER VIII。
SUMATRA。
（NOVEMBER 1861 to JANUARY 1862。）
The mail steamer from Batavia to Singapore took me to Muntok （or as on English maps； 〃Minto〃）； the chief town and port of Banca。 Here I stayed a day or two； until I could obtain a boat to take me across the straits； and all the river to Palembang。 A few walks into the country showed me that it was very hilly； and full of granitic and laterite rocks； with a dry and stunted forest vegetation； and I could find very few insects。 A good…sized open sailing…boat took me across to the mouth of the Palembang river where； at a fishing village； a rowing…boat was hired to take me up to Palembanga distance of nearly a hundred miles by water。 Except when the wind was strong and favourable we could only proceed with the tide； and the banks of the river were generally flooded Nipa…swamps； so that the hours we were obliged to lay at anchor passed very heavily。 Reaching Palembang on the 8th of November； I was lodged by the Doctor； to whom I had brought a letter of introduction； and endeavoured to ascertain where I could find a good locality for collecting。 Everyone assured me that I should have to go a very long way further to find any dry forest； for at this season the whole country for many miles inland was flooded。 I therefore had to stay a week at Palembang before I could determine my future movements。
The city is a large one； extending for three or four miles along a fine curve of the river； which is as wide as the Thames at Greenwich。 The stream is； however； much narrowed by the houses which project into it upon piles； and within these； again； there is a row of houses built upon great bamboo rafts； which are moored by rattan cables to the shore or to piles； and rise and fall with the tide。
The whole riverfront on both sides is chiefly formed of such houses； and they are mostly shops open to the water； and only raised a foot above it； so that by taking a small boat it is easy to go to market and purchase anything that is to be had in Palembang。 The natives are true Malays； never building a house on dry land if they can find water to set it in； and never going anywhere on foot if they can reach the place in a heat。 A considerable portion of the population are Chinese and Arabs； who carry on all the trade； while the only Europeans are the civil and military officials of the Dutch Government。 The town is situated at the head of the delta of the river； and between it and the sea there is very little ground elevated above highwater mark； while for many miles further inland； the banks of the main stream and its numerous tributaries are swampy； and in the wet season hooded for a considerable distance。 Palembang is built on a patch of elevated ground； a few miles in extent； on the north bank of the river。 At a spot about three miles from the town this turns into a little hill； the top of which is held sacred by the natives； shaded by some fine trees；and inhabited by a colony of squirrels which have become half…tame。 On holding out a few crumbs of bread or any fruit； they come running down the trunk； take the morsel out of your fingers； and dart away instantly。 Their tails are carried erect； and the hair； which is ringed with grey； yellow； and brown； radiates uniformly around them； and looks exceedingly pretty。 They have somewhat of th