photographing wild animals, though the dangers there were surpassed when
they went to Earthquake Land, as they called it. The details of their
happenings there will be found in the fifth volume of the series.

Perilous days on the Mississippi followed, when Blake and Joe took
pictures of the flood, and later they were sent to Panama to make views
of the digging of the big canal.

Mr. Hadley was a producer who was always eager for new thrills and
effects. And when he thought he had exhausted those to be secured on the
earth, he took to the ocean. And in "The Moving Picture Boys Under the
Sea," the book that immediately precedes the present volume, will be
found set down what happened to Blake and Joe when, in a submarine, they
took views beneath the surface.

They had not long been home from their experiences with the perils of
the deep when they were engaged to make views for "The Dividing Line,"
with its battle pictures, more or less real.

"What's the matter? What happened? Is any one hurt?" cried Mr. Hadley,
as he ran toward the scene of the explosion, followed by Blake and Joe.
They could see, by a large cloud of smoke, that something extraordinary
had occurred. The figures of several men could be noted running about.

"Is anybody hurt?" demanded the producer again, as he and the two boys
reached the place. "I'll send the ambulance, if there is." For when a
film battle takes place men are often wounded by accident, and it is
necessary to maintain a real hospital on the scene.

"I don't believe any one's hurt," remarked Mr. Robertson, who did