"A splendid plan," said Mr. Hume; and very soon it was carded out, a couple of shots being fired into the dark passage as a warning to the enemy to keep off. As the flames caught the sulphur, a thick smoke rolled away. "That will stop them; and now we can wait in peace till the morning."

The rest of the night passed for them in peace as far as their assailants were concerned, but the chilling damp of the vaults got into their bones, and Venning was pinched and shivering when the first ray of sunshine struck slanting down through the mist-laden atmosphere, bringing with it a message of hope from the bright outer world.

CHAPTER XXIII

THROUGH THE VAULTS

They shared the goats'-milk remaining in the calabash, and at once entered the first exit, that was to lead them, as they ardently hoped, into the warmth and light of the day. Venning went first, carrying only the strange lantern, and Mr. Hume a foot behind, ready to support the boy with a helping hand if he were again overcome by dizziness. Their progress was slow, owing to the dark, but the going was easy enough with a gradual ascent. What pleased them very much was the dwindling of the hubbub made by the waters—a sign that they were going away from that source of danger. In silence and in darkness they kept on up to a point where the walls widened out, and where there was a familiar hut-like smell, necessitating a pause for investigation. Mr. Hume struck a match—for the fungus-lamp shed no ray—and holding it up, disclosed a slab of rock with a pile of white ash on it. Blowing upon this, he started a glow from the still live embers beneath, and placing on a few half-burnt sticks, soon made a fire. By its light they saw a couple of rush-mats, such as the natives make, on the floor, and these, added to the fire, made a blaze which lit up a cavern bearing evidence of frequent use; for there were other mats on a ledge, together with several calabashes, and an earthen pot of native make. Seeing where the passage continued, they hurried on, for these human belongings reminded them forcibly of the existence of beings they had no wish to meet in those dark passages.

"How do you account for people living down here?" asked Venning.

"They may be outcasts from the village, afflicted either by disease or madness, or they may be members of some dark superstition."

"Ugh! I wonder if the Inkosikasi has any connection with them?"

"I rather think so, and when we get out we will have a word with her."

"When we get out! But it will be fine to see old Dick again, and to see the birds and insects on the move in the sun. Halloa! the path turns again—bends to the left."