“The sun!”
Gideon Spilett was quite right in his reply. It was the sun which had furnished the heat which so astonished Pencroft. The sailor could scarcely believe his eyes, and he was so amazed that he did not think of questioning the engineer.
“Had you a burning-glass, sir?” asked Herbert of Harding.
“No, my boy,” replied he, “but I made one.”
And he showed the apparatus which served for a burning-glass. It was simply two glasses which he had taken from his own and the reporter’s watches. Having filled them with water and rendered their edges adhesive by means of a little clay, he thus fabricated a regular burning-glass, which, concentrating the solar rays on some very dry moss, soon caused it to blaze.
The sailor considered the apparatus; then he gazed at the engineer without sayin
