The one over the very centre of the old crater, showing that we were wrong in supposing it to be extinct: it was only slumbering.

It is in what vulcanologists term moderate eruption now, and, perhaps, may prove a safety-valve which will prevent a more violent explosion." That the cone of Perboewatan was indeed in a state of considerable activity, worthy of a stronger term than "moderate," was very obvious.
Although at a distance, as we have said, of four miles, the glare of its fires on the three figures perched near the top of Rakata was very intense, while explosion after explosion sent molten lava and red-hot rocks, pumice, and dust, high into the thickening air--clouds of smoke and steam being vomited forth at the same time.

The wind, of which there was very little, blew it all away from the position occupied by the three observers.
"What if the wind were to change and blow it all this way ?" asked Nigel, with very pardonable feelings of discomfort.
"We could return to the cavern," said the hermit.
"But what if Rakata itself should become active ?" It was evident from the very solemn expression on the negro's face that he awaited the reply to Nigel's question with some anxiety.
"Rakata," answered the hermit thoughtfully, "although the highest cone, is the one most distant from the great centre of activity.

It is therefore not likely that the volcanic energy will seek a vent here while there are other cones between us and Perboewatan.

But we shall soon see whether the one vent is likely to suffice.