Robert caught one of the brilliant creatures. Paganel was right. It was a kind of large beetle, an inch in length, to which the Indians give the name of "tuco-tuco." This curious insect threw out flashes at two points situated in front of its sheath, and its light would have enabled one to read in the darkness. Paganel, on bringing it close to his watch, saw that it was ten o'clock.
Glenarvan now joined the major and the three sailors, and gave them instructions for the night. A terrible storm was to be expected. After the first rollings of the thunder, the wind would doubtless break forth and the tree be violently shaken. It was, therefore, advisable for every one to tie himself firmly to the bed of branches that had been appropriated to him. If they could not avoid the torrents of the sky, they must at least guard against those of the earth, and not fall into the rapid current that broke against the trunk of the tree. They wished each other good night without much hope of passing one, and then each, getting into his aerial resting-place, wrapped himself in his poncho and waited for sleep.
The incessant flashes assumed various forms. Some, darting perpendicularly towards the earth, were repeated five or six times in the same place; others spread in zigzag lines, and produced on the dark vault of the heavens astonishing jets of arborescent flame.
But the approach of a mighty tempest brings to the hearts of most sentient beings a vague anxiety of which the bravest cannot divest themselves. The occupants of the tree, agitated and fearful, could not close their eyes, and the first thunder-clap found them all awake. It took place about eleven o'clock, resembling a distant rumbling. Glenarvan climbed to the end of the branch, and peered out from the foliage. The dark firmament was fitfully illumined by vivid and brilliant flashes, which the waters brightly reflected, and which disclosed great rifts in the clouds. Glenarvan, after surveying the zenith and the horizon, returned to his couch.
"What do you think, Glenarvan?" asked Paganel.
"I think that the storm is beginning, and, if it continues, it will be terrible."