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 gas-bag had swollen to a goodly rotundity and was jerking strongly upon its lashings.
"Midsummer madness!" snorted Summerlee.
Lord John was delighted with the whole idea. "Clever old dear, ain't he?" he whispered to me, and then louder to Challenger. "What about a car?"
"The car will be my next care. I have already planned how it is to be made and attached. Meanwhile I will simply show you how capable my apparatus is of supporting the weight of each of us."
"All of us, surely?"
"No, it is part of my plan that each in turn shall descend as in a parachute, and the balloon be drawn back by means which I shall have no difficulty in perfecting. If it will support the weight of one and let him gently down, it will have done all that is required of it. I will now show you its capacity in that direction."
He brought out a lump of basalt of a considerable size, constructed in the middle so that a cord could be easily attached to it. This cord was the
