you can right into the midst of the
tree that's on fire."

"Oh, I get your drift! Well, you can count on me."

Ned picked up from the floor of their aeroplane a metal can similar to
those Tom used to hold oil or perhaps spare gasoline when he was
experimenting on airship speed. The opening was closed with a screw
plug, with wings to afford an easier grip. As Ned unscrewed this his
nostrils were greeted by an odor that made him gasp.

"Don't mind a little thing like that," cried Tom. "Drop it down, Ned!
Drop it down! We're going to be right over the tree in another second
or two!"

Ned leaned over the side of the craft and had a good view of the
strange sight. The tree that was on fire was a dead oak of great size,
dwarfing the other trees in the grove in which it stood. In common with
other oaks this one still retained many of its dried leaves, though it
was devoid, or almost devoid, of life. Ned noticed in the branches many
irregularly shaped objects, and it appeared to be these that were on
fire, blazing fiercely.

"It looks as though some one had tied bundles of sticks in the tree and
set them on fire," Ned thought as he poised the opened tin of the
evil-smelling compound on the edge of the aeroplane's cockpit.

"Let her go, Ned!" cried Tom. "You'll be too late in another second!"

Ned raised himself in his seat and threw, rather than let fall, the can
straight for the blazing tree. Like a bomb it shot toward earth, and
Ned and Tom, looking down, could see it strike a limb and break open,
the rupture of the can letting loose the liquid contained in it.

And then, before the eyes of Tom and Ned, the fire seemed to die out as
a picture melts away on a moving picture screen. The smoke rolled away
in a ball-like cloud, and the flames ceased to crackle and roar.

"Well, for the love of molasses! what happened, Tom?" cried Ned, as the
young inventor guided his craft about in a big circle to come back
again over the tree. He wanted to make sure that the fire was out.

It was!

"What sent that blaze to the happy hunting grounds?" asked Ned.

"My new aerial extinguisher," answered Tom, with justifiable pride in
his voice. "This fire happened in the nick of time for me, Ned. I had a
tin of my new combination in the car, not with any intention of using
it, though. I intended to pour it in the new containers I am having
made in Newmarket to see if it would corrode them, a thing I wish to
avoid.

"But when I saw t