"Warned to turn back?" repeated the boys in chorus. "By whom?"

"A black browed chap who gave the name of Wyckoff, and who said that he wouldn't have anyone fooling around the Spanish Chest but those who rightfully should share the treasure. We didn't know what he meant, and told him so, but he wouldn't believe us."

"The Spanish Treasure Chest!" gasped Jack. "What about it?"

"I don't know anything about it!" stoutly a.s.serted Frank.

"We've heard a little about it," volunteered Jack, "but nothing definite. We would like to know more and to know why these fellows should oppose your coming to this vicinity."

"I've told you all I know about that part of the story," declared Frank.

"Now you know as much as I do in that line."

"What did this Wyckoff look like?" asked Harry eagerly.

"He's black--I don't mean that he's a negro,--but he's one of these fellows with a blue-black beard that never can be shaved clean because it shows black under the skin. Then he's got a shifty eye and a sneaky look about him. Then, too," he added with a smile, "he's got a smashed nose where my fist landed when he put me ash.o.r.e here. I certainly handed him a beauty that time!"

"Good for you," cried Harry, clapping Frank on the shoulder.

"What was the cause of that?" asked Jack, "did he hit you?"

"Well, to make a long story short," Frank continued, "he and his gang kidnapped Charley and me from the 'Spray' two nights ago. Where they've got Charley I don't know. They put me ash.o.r.e here without a thing to eat or drink and with nothing to make a fire with. As I was shoved ash.o.r.e and before the boat got away, I ran up and landed on him. They were on a schooner of which Wyckoff seemed to be captain. I hope they haven't made away with Charley."

"If Charley is as resourceful as you, he's all right," consoled Jack. "I admire your grit and ability. How did you get a fire?"

"I made a fire stick as all Boy Scouts can and took a shoe lace for a bow string. I had hard work getting the first tiny blaze, but after that I've kept a bed of coals covered with sand as a reserve. I found a piece of wreckage and used part of it for a shelter. One part had a long spike in it and that I sharpened by sc.r.a.ping it on some of the sh.e.l.ls. Then I got a piece of fat pine that had washed ash.o.r.e and made me a torch. With this sharp spike and the torch I went fishing at night and got three dandy big flounders."

"What's a flounder?" asked Arnold intensely interested.

"Well," explained Frank, "a flounder is a queer sort of a flat fish.

He's dark on top and white on the bottom. He swims on his side and has his two eyes on the one side of his head unlike any other fish. When the tide comes in he comes close insh.o.r.e and burrows down into the sand to wait till a minnow floats by. He reaches up and snaps Mr. Minnow and then goes on to another good spot. If you take a bright light you can walk right up to the flounder without alarming him. Then before he knows what is coming, you thrust a spear down through his head and you have him."

"Did you get yours that way?" eagerly asked Arnold.

"Not the first one," replied Frank with a laugh. "I just scared the first one. And I'm afraid I forgot for a minute that I was a Boy Scout.

I was mighty hungry and that fellow looked so nice and fat I just felt as if I simply had to have him."

Jack's arm stole inside Frank's and a pressure of sympathy told the Bob White that a Beaver understood his former trouble.

"I move we go and get Frank's fire stick and bow," Harry suggested, "and then put out the signal fires and hit the trail for the mainland. It is getting along in the afternoon and I'm hungry and if we make Pascagoula tonight, we'll have to go some."

"Second the motion," declared Arnold. "But where does Pascagoula lie from here? Where is this place, anyway?"

"We're on Pet.i.t Bois Island, I think," replied Frank. "At least, one of the men suggested that I be put ash.o.r.e on Pet.i.t Bois and the rest agreed, arguing that I would stay here only a short time before some fishermen would visit the island and find me."

"Then in that case," Jack stated, "Pascagoula lies just about northwest of us. If our compa.s.s hadn't been disarranged by the horseshoe, we'd have been in the harbor by this time," he added.

"Your compa.s.s disarranged by a horseshoe?" queried Frank.

"Yes," was Jack's laughing rejoinder. "Did you ever hear such a tale?

And it was lucky for you it happened. There's a case of a horseshoe being lucky for you when you've never seen it yet!"

After Jack had related the tale of the horseshoe and its relation to their present situation, Arnold suggested that they visit Frank's camp and then go aboard the Fortuna. This met the approval of all the boys. A trip to the wreckage disclosed the fact that Frank had made his bed on the hard, smooth sand with a fire in front of him for protection from the chill winds of the night.

"Here's the fire stick," exultantly cried Arnold. "Gee, won't I have a great story written about this adventure when I get back to little old Chi. Sherman Street won't know me when I arrive."

"Hurray," cried Harry who had wandered a short distance from the others.

"Hurray, I've found the horse that belongs to the horseshoe! Here he is buried upside down in the sand."

Hastening to the spot indicated the boys saw what looked to be a horse's foot upside down in the sand. So startling was the resemblance that Jack and Arnold were completely deceived for a moment, but Frank's laugh soon indicated that they had been mistaken.

"What is it?" asked Arnold eagerly. "Gee, but I see so many new things here I don't know which to write a story about first."

"Better not write any story about this," admonished Frank. "The wonderful phenomenon you see before you, my friend, is not a horse at all. It is merely a crab sh.e.l.l from which the crab has gone."

"A crab sh.e.l.l?" repeated Arnold in wonderment. "A real crab?"

"Sure enough," declared Frank. "The underside of the sh.e.l.l has exactly the same outlines as the under side of a horse's foot. This fellow has projecting from the heel a spikey tail that is hard and sharp at the end. The whole thing, as you see, is dried and hardened by exposure to the weather. The crab has been gone a long time."

"I'm going to take it along," a.s.serted Arnold. "I'll put it in my locker and make a collection of things I pick up. I'd like to see a flounder now so as to recognize one the next time I see it."

"I have a fine big fellow at the place I had my fires," Frank answered.

"We'll go over there and see how he's getting on. I got him last night.

I think he must weigh as much as three or four pounds."

"Tell me some more about this Spanish Treasure Chest," Jack said as the boys turned toward the site of Frank's camp. "I'm anxious to know everything you overheard anywhere that would have a bearing on the matter from any viewpoint. It's interesting."

"I can't tell you any more than I have. I know these fellows objected to our visiting this locality because they seemed to believe that we were trying to get something that belonged to them and they were ready to employ force if necessary to keep us out," Frank said.

"We know they are a desperate gang," Jack admitted. "Our own experiences show that. They also believe we are here on the same mission and already they have attempted to disable and sink our boat."

Frank stopped in alarm. Glancing hurriedly about he grasped Jack's arm and in a trembling tone entreated him to leave the vicinity at his earliest opportunity. Jack's answer was a negative shake of his head.

His companions also indicated their disapproval of the course.

"Well, here's the flounder," announced Frank at last picking up a fine specimen of that denizen of the Gulf waters. "He's a beauty."

The boys gathered about the fish admiring and investigating the peculiarities already mentioned by Frank. At last Harry spoke:

"But he wouldn't be good raw and you had to have a fire. I'm always interested in seeing fire produced from a stick."

"Oh, that's not so difficult," Frank answered; "watch me."

Kneeling on the sand he grasped his fire stick in his left hand after placing the bowstring in position. With a sh.e.l.l over the upper end of the stick, he sawed away busily for a moment. A tiny wreath of smoke eddied away from the lower end of the stick.

"Hurray," cried Harry, "You're fetching it. I can see it coming around the bend. Just look at that, boys. I can see it coming."

"Put up your hands," came a coa.r.s.e voice from the rear.

Startled, the lads with one accord jumped to their feet to see their guest of a short time previous pointing an automatic at them.