An examination, through a powerful telescope in the bright light of morning, showed the travelers that they were over the outskirts of a large city, which, later, they learned was Rome, Italy.

“We’ve made a good trip,” said Tom.  “The gale had us worried, but it sent us along at a lively clip.  Now for Switzerland, and the avalanches!”

They made a landing at a village just outside the “Holy City,” as Rome is often called, and renewed their supply of gasolene.  Naturally they attracted a crowd of curious persons, many of whom had never seen an airship before.  Certainly few of them had ever seen one like Tom Swift’s.

The next day found them hovering over the Alps, where Tom hoped to be able to get the pictures of snow slides.  They went down to earth at a town near one of the big mountain ranges, and there made inquiries as to where would be the best location to look for big avalanches.  If they went but a few miles to the north, they were told, they would be in the desired region, and they departed for that vicinity.

“And now we’ve just got to take our time, and wait for an avalanche to happen,” remarked Tom, as they were flying along over the mountain ranges.  “As Mr. Damon said, these things aren’t made to order.  They just happen.”

For three days they sailed in and out over the great snow-covered peaks of the Alps.  They did not go high up, for they wanted to be near earth when an avalanche would occur, so that near-view pictures could be secured.  Occasionally they saw parties of mountain climbers ascending some celebrated peak, and for want of something better to photograph, Tom “snapped” the tourists.

“Well, I guess they’re all out of avalanches this season,” remarked Ned one afternoon, when they had circled back and forth over a mountain where, so it was said, the big snow slides were frequent.

“It does seem so,” agreed Tom.  “Still, we’re in no hurry.  It is easier to be up here, than it is walking around in a jungle, not knowing what minute a tiger may jump out at you.”

“Bless my rubbers, yes!” agreed Mr. Damon.

The sky was covered with lowering clouds, and there were occasionally flurries of snow.  Tom’s airship was well above the snow line on the mountains.  The young inventor and Ned sat in the pilot house, taking observations through a spyglass of the mountain chain below them.

Suddenly Ned, who had the glass focused on a mighty peak, cried out: 

“There she is, Tom!”

“What?”

“The avalanche!  The snow is beginning to slide down the mountain!  Say, it’s going to be a big one, too.  Got your camera ready?”

“Sure!  I’ve had it ready for the last three days.  Put me over there, Ned.  You look after the airship, and I’ll take the pictures!”

Tom sprang to get his apparatus, while his chum hurried to the levers, wheels and handles that controlled the Flyer.  As they approached the avalanche they could see the great mass of ice, snow, big stones, and earth sliding down the mountain side, carrying tall trees with it.