The level ground at the base of the cone, widest on the southern side, is covered with tall bamboo grass and various kinds of low bushes. On the inner slopes of the crater, the south and east sides, which are of rocky formation, support a certain amount of small forest, in which we quickly noticed the absence of such tropical forms as palms, rattans and lianas, and of trees more than 60 or 70 feet high and 4 or 5 feet in diameter;[7] the remaining sides, composed mainly of volcanic ash, afford foothold only to a coarse tussocky plant growing in clumps on the loose black dust. We found these latter slopes not at all an attractive scene of operations, for the feet sank and slipped at every step, and raised at the same time clouds of fine black dust.
During the day the heat in the interior was extreme, for the sun's rays beat down upon, and were reflected from, the dark slopes, while the wall of the crater completely cut off any sea breeze. We did not ascend the cone, for our stay was to be short, and we wished to investigate the fauna as fully as possible; but from reports of the visits paid to the island once every three or four years from Port Blair, it would seem that the slight signs of activity still existent consist of an issue of steam and the continued sublimation of sulphur; while of the two cones which form the top, one is cold, and already bamboo grass and ferns are beginning to clothe the entire summit. There is ample proof in those details which have been recorded of the island during the last century that the volcano is rapidly becoming quiescent, and is indeed, perhaps verging on a condition of extinction, as has long been the case with Narkondam.
Captain Blair, who passed near in 1795, writes of enormous volumes of smoke and frequent showers of red-hot stones. "Some were of a size to weigh three or four tons, and had been thrown some hundred yards past the foot of the cone. There were two or three eruptions while we were close to it; several of the red-hot stones rolled down the sides of the cone and bounded a considerable way beyond us.... Those parts of the island that are distant from the volcano are thinly covered with withered shrubs and blasted trees."