"It is phosphorescence, I suppose," said Glenarvan.
"No, but phosphorescent insects, positive glow-worms, living diamonds, which the ladies of Buenos Ayres convert into magnificent ornaments."
"What!" exclaimed Robert, "those sparks flying about are insects!"
"Yes, my boy."
Robert caught one in his hand, and found Paganel was right. It was a kind of large drone, an inch long, and the Indians call it "tuco-tuco." This curious specimen of the COLEOPTERA sheds its radiance from two spots in the front of its breast-plate, and the light is sufficient to read by. Holding his watch close to the insect, Paganel saw distinctly that the time was 10 P. M.
On rejoining the Major and his three sailors, Glenarvan warned them of the approaching storm, and advised them to secure themselves in their beds of branches as firmly as possible, for there was no doubt that after the first clap of thunder the wind would become unchained, and the OMBU would be violently shaken. Though they could not defend themselves from the waters above, they might at least keep out of the rushing current beneath.
They wished one another "good-night," though hardly daring to hope for it, and then each one rolled himself in his poncho and lay down to sleep.
But the approach of the great phenomena of nature excites vague uneasiness in the heart of every sentient being, even in the most strong-minded. The whole party in the OMBU felt agitated and oppressed, and not one of them could close his eyes. The first peal of thunder found them wide awake. It occurred about 11 P. M., and sounded like a distant rolling. Glenarvan ventured to creep out of the sheltering foliage, and made his way to the extremity of the horizontal branch to take a look round.
The deep blackness of the night was already scarified with sharp bright lines, which were reflected back by the water with unerring exactness. The clouds had rent in many parts, but noiselessly, like some soft cotton material. After attentively observing both the zenith and horizon, Glenarvan went back to the center of the trunk.
"Well, Glenarvan, what's your report?" asked Paganel.
"I say it is beginning in good earnest, and if it goes on so we shall have a terrible storm."
"So much the better," replied the enthusiastic Paganel; "I should like a grand exhibition, since we can't run away."
"That's another of your theories," said the Major.
"And one of my best, McNabbs. I am of Glenarvan's opinion, that the storm will be superb. Just a minute ago, when I was trying to sleep, several facts occurred to my memory, that make me hope it will, for we are in the region of great electrical tempests. For instance, I have read somewhere, that in 1793, in this very province of Buenos Ayres, lightning struck thirty-seven times during one single storm. My colleague, M. Martin de Moussy, counted fifty-five minutes of uninterrupted rolling."
"Watch in hand?" asked the Major.
"Watch in hand. Only one thing makes me uneasy," added Paganel, "if it is any use to be uneasy, and that is, that the culminating point of this plain, is just this very OMBU where we are. A lightning conductor would be very serviceable to us at present. For it is this tree especially, among all that grow in the Pampas, that the thunder has a particular affection for. Besides, I need not tell you, friend, that learned men tell us never to take refuge under trees during a storm."
"Most seasonable advice, certainly, in our circumstances," said the Major.
"I must confess, Paganel," replied Glenarvan, "that you might have chosen a better time for this reassuring information."
"Bah!" replied Paganel, "all times are good for getting information. Ha! now it's beginning."
Louder peals of thunder interrupted this inopportune conversation, the violence increasing with the noise till the whole atmosphere seemed to vibrate with rapid oscillations.
The incessant flashes of lightning took various forms. Some darted down perpendicularly from the sky five or six times in the same place in succession.