e place Mr. Wallace looked somewhat surprised, then consulted a map
which he had procured at Boma. He folded it up without a word, however,
and they entered the town.

"We're in the elephant country at last," announced Montenay that night.
"These fellows say that there is a small herd off to the east two miles.
Suppose we go over to-morrow."

"To the east?" repeated Mr. Wallace. "Aren't we rather working away from
our bearings? However, no matter. I'm after ivory and not particular
where I find it. We'll go to-morrow."

Burt was just a little puzzled at his uncle's attitude. He said nothing
definite, but the boy in some way got the idea that he was watching
Captain Mac. At first Burt put aside the thought. Then he resented it,
for he had a strong liking for the eccentric Scotchman. Finally he
resolved to wait and see what turned up.

That night his suspicions were confirmed. He and Critch slept together
in one of the small tents and as they arranged the mosquito nets for the
night Howard paused.

"Say, did you notice anything funny about Cap'n Mac lately?"

"No," replied Burt. "Uncle George is acting kind of funny, though."

"You bet he is," nodded Critch. "He's just about got the goods on Cap'n
Mac, too!"

"What!" Burt stared at his chum eagerly. "I knew it! Spit it out, old
sport."

"It's that compass business. Anyway, that got your uncle going. When we
was ridin' after that hartebeest to-day he comes out with it. This here
place ain't on our line o' march at all. We're 'way east of where we
ought to be!"

"East!" repeated Burt. "What's that got to do with Cap'n Mac?" He was
still ready to stand up for his friend, though Howard's confident air
sorely shook his faith.

"Like this. Your uncle says Montenay's been leadin' us wrong. He don't
know what for and he's waiting to find out. B'lieve me, I'd hate to be
Cap'n Mac when he does find out! Golly, he was mad to-day!"

"Does he think Cap'n Mac swiped our compasses?"

"You bet! Thinks that business with Mgoro was a put-up job, too. When we
were out to-day we found a young eland lying dead. It had two o' the
blamedest arrows in it you ever seen. Here's the head o' one."

Critch produced a little bundle of skin from his pocket and very
carefully unwrapped it. He laid a long many-barbed iron point in Burt's
hand.

"Watch out for it. That black stuff's poison, your uncle says. It's a
pigmy arrow."

"What's a pigmy arrow?" asked Burt. "Oh, you mean--" he