indeed, it presents the appearance of one vast surface of sombre evergreen forest, starred with flowering orchids, and wreathed with creepers, of a richness perhaps unsurpassed even in South America.
The hills and ranges of upland consist of blue metamorphic limestone on which is superposed a thick series of sandstones, conglomerates, and clay-shales. Piercing these beds are granite and a variety of plutonic rocks, as diorite, porphyrite, etc. These latter are developed in greatest abundance in the antimony districts, where they are in immediate contact with the limestone that has been fissured and tortured by upheaval. The sandstone shales have also been tilted and distorted; nevertheless in places they retain their original horizontal position. They are usually found to be impregnated with peroxide of iron. It is in this formation that the cinnabar deposits occur.
Both lime and sandstone have been extensively denuded, and the latter rises in isolated tabular mountains, or short peaky trends, to an altitude occasionally of 1500 feet above the sea, the ridges separated by undulating valleys, in which the limestone comes to the surface. Sometimes these denuded masses form low hilly tracts varying in elevation from 200 feet to 1200 feet; sometimes they appear as solitary crags, but invariably present long lines of ancient sea-cliff, and bold scarped faces, fissured and jointed in every conceivable direction.
In the intervening lowlands is a deposit of dark yellow felspathic clay varying in depth from a few feet to eighty feet and more, derived from the degradation of the hills by water. Associated with this clay and of more recent date are superficial deposits of pudding-stone and river gravels. The intrusive igneous rocks show mainly in the form of dykes, seaming the stratified rocks; consequently volcanic action took place subsequent to their deposition, but it was also antecedent to the more recent of the superficial deposits. It is in immediate connection with those plutonic dykes that we find the deposits of arsenic and cinnabar, occupying the fissures produced in the stratified rocks by volcanic upheavals, and we are led to the conclusion that these mineral lodes were deposited after the cessation of the upheaval.
Gold occurs in the form of fine sand in the alluvial deposits, and in the gravel of the rivers over a great part of Sarawak; and also in pockets of the limestone, in which it has been allowed to fall by water. Nuggets are of extremely rare occurrence, but Sir Spencer St. John mentions having seen one of seven ounces taken from the auriferous clay at Krian near Bau. The gold dust is usually in a state of finest comminution. So far no gold reef has been come upon.
In former days gold was extensively washed by Chinese at Bau and Paku in Upper Sarawak, which auriferous district commences at the confluence of the two branches of the Sarawak river, and extends back to their sources and the boundary of Dutch Borneo. As gold and antimony were known to abound here, the Chinese of Sambas and the lower Kapuas had made several endeavours to establish themselves in the district, but were much harassed by the Malays until the accession of the late Rajah Brooke, which made it possible for them to settle there and pursue in peace their business of gold mining. Then gold was washed extensively, and the fine reservoirs and "leats" which the Chinese constructed to sluice the alluvial soil remain to this day. They increased and became a thriving community, but they were not sufficiently looked after, and, falling under the machinations of socialistic Secret Societies, gradually got out of hand and broke into open rebellion in 1857, as shall be related in the sequel. It is sufficient to say here that this ended in dire ruin to themselves, and that the few who escaped were driven over the borders; but it also ruined the gold-mining industry, and, though some of the rebels returned and others came with them, the industry never fully recovered, and later on it received a further check by the introduction of pepper planting, which gave the Chinese a more profitable occupation, and gradually Upper Sarawak became covered with gardens of this description. Though gold mining under the Chinese practically died out, modern scientific and engineering skill has now placed it in a far higher position than it had ever previously attained, or could have attained under the primitive methods of the previous workers.
Quicksilver was discovered in situ about the year 1871, by Messrs. Helms and Walters of the Borneo Company, who prospected over the whole of Sarawak Proper, and ultimately succeeded in tracking the small fragments of cinnabar that are scattered over the district to a hill on the right bank of the Staat river. The hill is called Tegora, and rises to an elevation of 800 feet. In the upper portion of this hill, the ore was found deposited capriciously in strains and pockets with here and there a little metallic mercury.[9]
In former years a large quantity of quicksilver was exported, but for some time this mineral product has ceased to appear as an item in the exports, the large deposit of cinnabar at Tegora having apparently been worked out. The existence of this mineral in other parts of the state is proved by traces found in several places, and the same may be said of antimony, of which there are indications of rich deposits; but the discovery of these minerals in paying quantities is a matter of chance. Antimony is still worked by the Borneo Company, Ltd., and a recent rise in the price has been an inducement to Chinese and Malay miners to increase the production, and the export of 1906 was more in quantity than it was in 1905, though small as compared with what it used to be.
Black bituminous coal, which occurs in the Tertiary strata, has been found in different parts, and two collieries are owned and worked by the Government, at Semunjan in the Sadong district, and at Brooketon. Several hundred Chinese are employed as miners under European supervision, and large sums have been expended upon machinery, etc.
Oil, a crude petroleum, has been discovered in two places; it is of good quality, and is an excellent lubricant.
It is not impossible, or indeed improbable, that diamond deposits in Sarawak will be found and exploited. No systematic operations in search of these precious stones have been attempted, the dense jungle which covers the country being an obstacle. The only people who wash for diamonds are the Malays, and these carry on their work in a very desultory and imperfect manner.
But agriculture and jungle produce have been, and will be, the main source of revenue to Sarawak, and prosperity to the country. We shall deal with these products, as well as with those that are mineral, more fully in a subsequent chapter.
The Bornean forest is so varied and so different at different hours and seasons that no description can possibly convey an adequate idea of it to those who have not known it. Infinite and ever changing are its aspects, as are the treasures it hides. Its beauties are as inexhaustible as the varieties of its productions. In the forest man feels singularly free. The more one wanders in it, the greater grows the sense of profound admiration before nature in one of its grandest aspects. The more one endeavours to study it, the more one finds in it to study. Its deep shades are sacred to the devotee of Science. Yet they afford ample food for the mind of the believer, not less than to that of the philosopher.[10]
And we would add, to the superstitious native, to whom the jungles teem with ghosts and spirits.
The Bornean jungles are full of life, and of the sounds of life, which are more marked in the early mornings and in the evenings. Birds are plentiful (there are some 800 species), some of beautiful plumage, but few are songsters. Insect life is very largely represented, and includes many varieties of the curious stick and leaf insects,[11] hardly to be distinguished from the twigs and leaves they mimic. Also the noisy and never tiring cicadas, whose evening concerts are almost deafening, and frogs and grasshoppers who help to swell the din. There are many varieties of beautiful butterflies, but these are to be found more in the open clearings. Though there are no dangerous animals, there are many pests, the worst being the leeches, of which there are three kinds, two that lurk in the grass and bushes, the other being aquatic—the horse-leech. Mosquitoes, stinging flies, and ants are common, and the scorpion and centipede are there as well. Snakes, though numerous, are rarely seen, for they swiftly and silently retire on the approach of man, and one variety only, the hamadryad, the great cobra or snake-eating snake, is said to be aggressive. The varieties of land and water snakes are many, there being some 120 different species. Natives often fall victims to snake bites. Pythons attain a length of over twenty feet;[12]
