part, too, went better; and after a little more rehearsal the producer called to Blake and Joe.

"Go to it, boys! Get the best results you can from this mimic battle. Maybe you'll soon be where it's hotter than this!"

"What does he mean?" asked Joe, as he picked up his camera and took his position where he could film the scenes at the farmhouse.

"I don't know," answered Blake, who was to take pictures of the marching Unionists. "Maybe there are more stunts for us to do in Earthquake Land."

"If there are I'm not going! I'd rather do undersea stuff than be around volcanoes."

"So would I. But we'll talk about that later. Say, that looks better!" and he motioned to the so-styled Confederates, who did seem to be putting more life into their work.

"Yes," agreed Joe. "I guess when it comes to shooting, and all that, there'll be action enough even for Mr. Hadley."

A little later the mimic battle scene was in full swing. Hundreds of blank cartridges were fired, smoke bombs filled the air with their dense vapor, and in the distance bursting shells tore up the earth, far enough removed from the positions of the men to preclude any danger.

The Unionists closed in around the farmhouse. Close-up scenes were made, showing Birdie Lee and Miss Shay fighting off their Confederate admirers.

Then came the turn in the battle where the Southern force had to give way.

"Burn the house, boys!" cried their officer; and this would be flashed on the screen later as a lead.

The dwelling, which had been purchased with the right to burn it, was set afire, and then began a scene that satisfied even the exacting producer. Great clouds of smoke rolled out, most of it coming from specially prepared bombs, and amid them and the red fire, which simulated flames, could be seen the Union leader carrying out his sweetheart, Birdie Lee.

Blake and Joe ground away at their cameras, faithfully recording the scenes for the thrill and delight of those who would afterward see them in comfortable theaters, all unaware of the hard work necessary to produce them.

The Confederates made a last stand at the barn. They were fired upon by the Unionists and finally driven off down the road—such as were left of them—while the victorious Northern fighters put out the fire in the house and the scene ended in the reuniting of long-separated lovers.

"Well, I'm glad that's over!" remarked Mr. Hadley, as he came up to Blake and Joe where they were taking their cameras apart in readiness for carrying them back to the studio. "It didn't go so badly, do you think?"

"I think it'll be a fine picture!" declared Joe.

"The last stand of the Confederates was particularly good," observed Blake.

"Good!" cried the producer. "That's a fine line for a leader—'The Last Stand.' I must make a note of it before I forget it. And now you boys can go back to New York. Have the films developed the first thing and let me know how they have come out."

"They'll probably be spoiled," put in the gloomy voice of C. C.

Mr. Hadley looked around far something to throw at him, but having nothing but his note book, which was too valuable for that, contented himself with a sharp look at the gloomy comedian.

"When will you want us again, Mr. Hadley?" asked Blake, as he and Joe made ready to go back in the automobile to New York, the "Southern" battle scene having taken place in a location outside of Fort Lee on the New Jersey bank of the Hudson River, where many large moving picture studios are located.

"Oh, that's so! I did want to talk to you about something new I have in mind," said Mr. Hadley. "Blake—and you, too, Joe—are you game for some dangerous work?"

"Do you mean such as we had in Earthquake Land?" asked Blake.

"Or under the sea?" inquired his partner.

"This is a call to battle," replied Mr. Hadley. "And it's real battle, too! None of this smoke-bomb stuff! Boys, are you game for some actual fighting?"

CHAPTER II

THE ACCIDENT

Not at all to the discredit of the moving picture boys is it to be considered when it is recorded that, following this question on the part of Mr. Hadley, they looked sharply at one another.

"A call to battle!" murmured Joe.

"Actual fighting?" added his chum wonderingly.

"Perhaps I'd better explain a bit," went on the film producer. "Most unexpectedly there has come to me an opportunity to get some exceptional pictures. I need resourceful, nervy operators to act as camera men, and it is only paying you two a deserved compliment when I say I at once thought of you."

"Thank you," murmured Blake.

"No thanks necessary," responded Mr. Hadley.

"So now I am ready to put my offer into words. In brief, it is——"

At that moment back of the farmhouse (which was partly in ruins, for the fire had been a real one) a loud explosion sounded. This was followed by shouts and yells.

"Somebody's hurt!" cried Mr. Hadley, and he set off on a run toward the scene, followed by Blake and Joe.

And while they are investigating what had happened, advantage will be taken of the opportunity to tell new readers something of the former books in this series, so they may feel better acquainted with the two young men who are to pose as "heroes," as it is conventionally termed, though, in truth, Joe and Blake would resent that word.

"The Moving Picture Boys" is the title of the first volume of the series, and in that the readers were introduced to Blake Stewart and Joe Duncan while they were working on adjoining farms. A moving picture company came to the fields to make certain scenes and, eventually, the two young men made the acquaintance of the manager, Mr. Hadley.

Blake and Joe were eager to get into the film business, and their wish was gratified. They went to New York, learned the ins and outs of the making of "shifting scenes," as the Scotchman called them, and they had many adventures. The boys became favorites with the picture players, among whom were the gloomy C. C., Miss Shay, Miss Lee, Harris Levinberg and Henry Robertson. Others were added from time to time, sometimes many extra men and women being engaged, in, for instance, scenes like these of "The Dividing Line."

Following their adventures in New York, which were varied and strenuous, the moving picture boys went out West, taking scenes among the cowboys and Indians.

Later they moved on, with the theatrical company, to the coast, where they filmed a realistic picture of a wreck. In the jungle was where we next met Blake and Joe, and they were in dire peril more than once, 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