“You shall have the credit of the discovery, never fear,” said the Colonel, “and your share of the profit, if there is any; but we have something else to think about now. Come up here; I want to see how our enemies are going on.”

He led the way back to the walls, and we followed him to the highest part of our fortress. The strength of the place seemed to explain a great deal, suggesting, as it did, that the builders must have had good reasons for the tremendous labour expended in making the place the stronghold it must have been.

“Ah,” said the Colonel, shading his eyes and gazing over the walls at the rocky part of the kopje, “I don’t want to be unmerciful; but I’m afraid we must clear the rocks of the enemy.”

“The apes?” said Denham.

“Yes; the vicious little brutes have bitten two of the men; but they had to pay for it, for three were killed and I don’t know how many wounded before the pack was driven off. You should both be well on the lookout when wandering about, and ready to use your revolvers, for the apes have steel-trap jaws, and muscles nearly as strong. It is astounding the strength there is in an ape.”

“But if you come to the question of strength, sir,” said Denham, “it seems to me that everything in nature is stronger than a man. Look at insects.”

“No, thank you, Mr Denham,” said the Colonel sarcastically. “I have something else to look at, and no time to listen to your lesson on natural history. Some evening, perhaps, when there is no danger, and I am sipping my coffee over a quiet pipe, I shall be happy to listen to you.”

“Thank you, sir,” said Denham.

“Is that meant to be sarcastic, my dear boy?” said the Colonel, laughing.

“Oh no, sir,” said Denham in an ill-used tone.