Others would have excited the interest of a SAVANT to the highest degree, for though Arago, in his curious statistics, only cites two examples of forked lightning, it was visible here hundreds of times. Some of the flashes branched out in a thousand different directions, making coralliform zigzags, and threw out wonderful jets of arborescent light.

Soon the whole sky from east to north seemed supported by a phosphoric band of intense brilliancy. This kept increasing by degrees till it overspread the entire horizon, kindling the clouds which were faithfully mirrored in the waters as if they were masses of combustible material, beneath, and presented the appearance of an immense globe of fire, the center of which was the OMBU.

Glenarvan and his companions gazed silently at this terrifying spectacle. They could not make their voices heard, but the sheets of white light which enwrapped them every now and then, revealed the face of one and another, sometimes the calm features of the Major, sometimes the eager, curious glance of Paganel, or the energetic face of Glenarvan, and at others, the scared eyes of the terrified Robert, and the careless looks of the sailors, investing them with a weird, spectral aspect.

However, as yet, no rain had fallen, and the wind had not risen in the least. But this state of things was of short duration; before long the cataracts of the sky burst forth, and came down in vertical streams. As the large drops fell splashing into the lake, fiery sparks seemed to fly out from the illuminated surface.

Was the rain the FINALE of the storm? If so, Glenarvan and his companions would escape scot free, except for a few vigorous douche baths. No. At the very height of this struggle of the electric forces of the atmosphere, a large ball of fire appeared suddenly at the extremity of the horizontal parent branch, as thick as a man's wrist, and surrounded with black smoke. This ball, after turning round and round for a few seconds, burst like a bombshell, and with so much noise that the explosion was distinctly audible above the general FRACAS. A sulphurous smoke filled the air, and complete silence reigned till the voice of Tom Austin was heard shouting:

"The tree is on fire."

Tom was right. In a moment, as if some fireworks were being ignited, the flame ran along the west side of the OMBU; the dead wood and nests of dried grass, and the whole sap, which was of a spongy texture, supplied food for its devouring activity.

The wind had risen now and fanned the flame. It was time to flee, and Glenarvan and his party hurried away to the eastern side of their refuge, which was meantime untouched by the fire. They were all silent, troubled, and terrified, as they watched branch after branch shrivel, and crack, and writhe in the flame like living serpents, and then drop into the swollen torrent, still red and gleaming, as it was borne swiftly along on the rapid current. The flames sometimes rose to a prodigious height, and seemed almost lost in the atmosphere, and sometimes, beaten down by the hurricane, closely enveloped the OMBU like a robe of Nessus. Terror seized the entire group. They were almost suffocated with smoke, and scorched with the unbearable heat, for the conflagration had already reached the lower branches on their side of the OMBU. To extinguish it or check its progress was impossible; and they saw themselves irrevocably condemned to a torturing death, like the victims of Hindoo divinities.

At last, their situation was absolutely intolerable. Of the two deaths staring them in the face, they had better choose the less cruel.

"To the water!" exclaimed Glenarvan.

Wilson, who was nearest the flames, had already plunged into the lake, but next minute he screamed out in the most violent terror:

"Help! Help!"

Austin rushed toward him, and with the assistance of the Major, dragged him up again on the tree.

"What's the matter?" they asked.

"Alligators! alligators!" replied Wilson.

The whole foot of the tree appeared to be surrounded by these formidable animals of the Saurian order.