[Danan solfatara.] On the upper slope of the Danan mountain, near to the summit, so much sulphur is deposited by the vapors from the sulphurated water that it may be collected with coconut shells.  In some crevices, which are protected against the cooling effects of the atmospheric air, it melts together in thick, brown crusts.  The solfatara of Danan is situated exactly south of that below, at the end of the ravine of the Kasiboi.  The clay earth, from which the silicic acid has been washed out by the rains, is carried into the valley, where it forms a plain, the greater part of which is occupied by a small lake, Malaksan (sour), slightly impregnated with sulphuric acid.  Its surface, which, by reason of the very flat banks, is protected against the weather, I found to be about five hundred paces long and one hundred broad.  From the elevation of the solfatara, a rather large fresh-water lake, surrounded by wooded mountains, is seen through a gap, exactly south, which is named Jaruanan.  The night was passed in a ruined shed at the south-east of the lake Malaksan; and on the following morning we climbed the south side of the mountain ridge and, skirting the solfatara of the Danan, arrived in an hour and a half at lake Jaruanan.

[Jaruanan Lake.] This lake, as well as the Malaksan, inspires the natives with superstitious fear on account of the suspicious neighborhood of the solfatara, and therefore has not been profaned by either mariner, fisher, or swimmer, and was very full of fish.  For the purpose of measuring its depth, I had a raft of bamboos constructed; and when my companions saw me floating safely on the lake, they all, without exception, sprang into it, and tumbled about in the water with infinite delight and loud outcries, as if they wished to indemnify themselves for their long abstinence; so that the raft was not ready before three o’clock.  The soundings at the centre of the basin, which was, at the southern edge, steeper than on the north, gave thirteen brazas, or over twenty-one meters of depth; the greatest length of the lake amounted to nearly eight hundred varas (six hundred and sixty-eight meters), and the breadth to about half as much.  As we returned in the evening, by torchlight, over the crest of the mountain to our night-quarters at the lake, we passed by the very modest dwelling-place of a married pair.  Three branches, projecting outwards from the principal trunk of a tree, and lopped at equal points, sustained a hut of bamboos and palm-leaves of eight feet square.  A hole in the floor formed the entrance, and it was divided into a chamber and ante-chamber, and four bamboo poles supported, above and below, two layers of bamboos, one of which furnished a balcony, and the other a shop in which betel was sold.