Tom Swift raised his electric rifle, took quick aim, and, having set it to deliver a moderate charge, pressed the button.  The result was surprising, for the snake being instantly killed the folds uncoiled and the ship shot upward, only, instead of rising on an even keel, the bow pointed toward the sky, while the stern was still fast to the earth.  Tilted at an angle of forty-five degrees the Black Hawk was in a most peculiar position, and those standing on the deck began to slide along it.

“There’s another snake at the stern!” cried Mr. Damon as he grasped a brace to prevent falling off.  “Bless my slippers! it’s the mate of the one you killed!  Shoot the other one, Tom!”

The young inventor needed no urging.  Making his way as best he could to the stern of the airship, he killed the second python, which was even larger than the first, and in an instant the Black Hawk shot upward, this time level, and as it should be.  Things on board were soon righted, and the travelers could stand upright.  High above the black jungle rose the craft, moving forward under the full power of the propellers, until Tom rushed into the engine room, and reduced speed.

“Well, talk about things happening!” exclaimed Ned, when they had somewhat recovered from the excitement.  “I should say they were beginning with a vengeance!”

“That’s the way in Africa,” declared Mr. Durban.  “It’s a curious country.  Those pythons generally go in pairs, but it’s the first time I ever knew them to tackle an airship.  They probably stay around here where there is plenty of small game for them, and very likely they merely anchored to our craft while waiting for a supper to come along.”

“It was a very odd thing,” said Tom.  “I couldn’t imagine what held us.  After this I’ll see that all is clear before I try to go up.  Next time we may he held by a troop of baboons and it strains the machinery to have it pull against dead weight in that way.”

However, it was found no harm had resulted from this experience, and, after reducing the gas pressure, which was taking them too high, Tom set the automatic rudders.

“We’ll keep on at slow speed through the night,” he explained, “and in the morning we’ll be pretty well into the interior.  Then we can lay our course for wherever we want to go.  Where had we better head for?”

“I don’t want to interfere with your plans,” said Mr. Anderson, “but I would like to rescue those missionaries.  But the trouble is, I don’t know just where to look for them.  We couldn’t get much of a line in Majumba on where the country of the red pygmies is located.  What do you think about it, Mr. Durban?”

“As far as elephant hunting goes we can probably do as well in the pygmy land as anywhere else,” answered the veteran, “and perhaps it will be well to head for that place.  If we run across any elephant herds in the meanwhile, we can stop, get the ivory, and proceed.”