Was the raft really floating on this substance, which is in the highest degree combustible? Where had this naphtha come from? Was it a natural phenomenon taking place on the surface of the Angara, or was it to serve as an engine of destruction, put in motion by the Tartars? Did they intend to carry conflagration into Irkutsk? Such were the questions which Alcide asked himself, but he thought it best to make this incident known only to Harry Blount, and they both agreed in not alarming their companions by revealing to them this new danger. It is known that the soil of Central Asia is like a sponge impregnated with liquid hydrogen. At the port of Bakou, on the Persian frontier, on the Caspian Sea, in Asia Minor, in China, on the Yuen-Kiang, in the Burman Empire, springs of mineral oil rise in thousands to the surface of the ground. It is an “oil country,” similar to the one which bears this name in North America. During certain religious festivals, principally at the port of Bakou, the natives, who are fire-worshipers, throw liquid naphtha on the surface of the sea, which buoys it up, its density being inferior to that of water. Then at nightfall, when a layer of mineral oil is thus spread over the Caspian, they light it, and exhibit the matchless spectacle of an ocean of fire undulating and breaking into waves under the breeze. But what is only a sign of rejoicing at Bakou, might prove a fearful disaster on the waters of the Angara. Whether it was set on fire by malevolence or imprudence, in the twinkling of an eye a conflagration might spread beyond Irkutsk. On board the raft no imprudence was to be feared; but everything was to be dreaded from the conflagrations on both banks of the Angara, for should a lighted straw or even a spark blow into the water, it would inevitably set the whole current of naphtha in a blaze. The apprehensions of Jolivet and Blount may be better understood than described. Would it not be prudent, in face of this new danger, to land on one of the banks and wait there? “At any rate,” said Alcide, “whatever the danger may be, I know some one who will not land!” He alluded to Michael Strogoff. In the meantime, on glided the raft among the masses of ice which were gradually getting closer and closer together. Up till then, no Tartar detachment had been seen, which showed that the raft was not abreast of the outposts. At about ten o’clock, however, Harry Blount caught sight of a number of black objects moving on the ice blocks. Springing from one to the other, they rapidly approached. “Tartars!” he thought. And creeping up to the old boatman, he pointed out to him the suspicious objects. The old man looked attentively. “They are only wolves!” said he. “I like them better than Tartars. But we must defend ourselves, and without noise!”