“So you shall,” said Challenger. “For some days I have exerted my whole brain force upon the problem of how we shall descend from these cliffs. We have satisfied ourselves that we cannot climb down and that there is no tunnel. We are also unable to construct any kind of bridge which may take us back to the pinnacle from which we came. How then shall I find a means to convey us? Some little time ago I had remarked to our young friend here that free hydrogen was evolved from the geyser. The idea of a balloon naturally followed. I was, I will admit, somewhat baffled by the difficulty of discovering an envelope to contain the gas, but the contemplation of the immense entrails of these reptiles supplied me with a solution to the problem. Behold the result!”

He put one hand in the front of his ragged jacket and pointed proudly with the other.

By this time the gasbag had swollen to a goodly rotundity and was jerking strongly upon its lashings.

“Midsummer madness!” snorted Summerlee.