"Humph! It's easy to get a picture---if you can find the animal,"
was Whopper's comment.

"This tells how to get a picture if you can't find the animal."

"What!"

"Exactly. Here are diagrams showing how to rig up a camera and a
flashlight, so that if the animal comes along in the dark and shoves
a certain string the light goes off and so does the camera, and the
picture is taken. If you want to, you can bait the string."

"Say, that's great!" cried Giant.

"I'd like to lay the game low---after I had the picture," was
Snap's comment.

"We can do that, too---sometimes."

After that the doctor's son gave his chums more details of what his
parent had said. All the boys were sure they could go out again,
for their return home from their previous trip had not been expected
by their parents.

"Were you thinking we might meet Ham Spink and his crowd?" asked
Giant during a short lull in the talk.

"Yes," answered Shep. "And if we do, they'll sure try to make
trouble for us."