They met with no difficulties on the way down.  Apparently the camp of the revolutionists had been moved from its former position at the narrows of the river.  It might be those in charge had taken the alarm and feared lest a government force must be on the way to capture them, after being informed about the camp by the spies they had sent up the river.

And Barranquila was finally reached, where they halted only long enough to chat a short time with Senor Jose, who met them as before on the quay and wanted to shake hands with the professor.

Knowing just how anxious the government was to get possession of airships just then, Frank did not want to give them any further chance to confiscate his neat little craft, under some pretense or other.  So they left the city at the mouth of the Magdalena and steamed away, bound once more for Maracaibo, where they meant to take steamer for New York, New Orleans or any port in the States.

The last glimpse they had of the river was the flood that was pouring out between the jaws of land marking one of the mouths of the Magdalena and making a distinct yellow area in the salty waters of the tropical ocean.

The beloved little aeroplane had been safely boxed again and was making the homeward voyage in their company.  What strange and wonderful things it had been through!  Andy declared that they almost passed belief, and he expressed his doubts as to their ever having an opportunity to pilot that same aircraft through atmospheric seas as tempestuous as those they had experienced in the tropics while rescuing the prisoner of the cliff bordered valley.  But then Andy was not gifted with second sight and he could not foresee what the wonderful future might have in store for the Bird boys.

They had by this time experienced enough of the fascinating new methods of cruising in cloudland to want to continue.  And it stands to reason that other adventures would be lying in wait for lads so constituted.

For the present it must be enough to say they arrived safely at good old Bloomsbury in due time and that the entire population was on hand to greet the party when they stepped from the train.  Also, the wonderful little monoplane, the same that had been equal to the test in the race for Old Thunder Top, had to be placed on public exhibition for several days in the town hall, where every man, woman and child in all the country around could examine and comment on the construction of the airship that had brought fame and happiness to Frank and Andy Bird.

In due time Puss and Sandy turned up, minus their biplane, which the government of Colombia had seized on some plausible pretext, though paying liberally for the same.  But they were soon at work constructing another, which they claimed would far exceed the one that had been lost.

Professor Bird by slow degrees recovered his health that had been sadly shattered by his experience down in that country.  But he declared that his days were over so far as aviation went, and that in the future he must be content to take a back seat and see the honors of the family carried off by the younger generation—­the Bird boys.