On the night when the pirates were so frightened by the fearful groan, Bill was lying awake, listening to the captain's story. When he came to the part where he describes the throwing the boy's father overboard, and speaks of the horrible groan, Bill put his mouth to the crevice, and imitated the groan, which had been too deeply fixed in his memory ever to be forgotten, giving full scope to his voice.

The effect astonished and frightened him as well as the pirates.

With the same success he imitated the Indian war-whoop, which he had learned while among the savages.

The next time that the pirates were so terribly frightened, the alarm was caused by Fire Cloud after his visit to the cave on the occasion that he had been taken for the devil by Bill, and an Indian ghost by Hellena.

Fire Cloud had remained in another chamber of the cavern connected with the secret passage already described, and where the echo was even more wonderful than the one pronounced from the opening through which the negro had spoken.

Here he could hear all that was passing in the great chamber occupied by the pirates, and from this chamber the echoes were to those who did not understand their cause, perfectly frightful.

All these peculiarities of the cavern had been known to the ancient Indian priests or medicine men, and by them made use of to impose on their ignorant followers.

BEADLE'S FRONTIER SERIES

1.The Shawnee's Foe.51.Madman of the Ocont.
2.The Young Mountaineer.52.Slim Jim.
3.Wild Jim.53.Tiger-Eye.
4.Hawk-Eye, the Hunter.54.The Red Star of the Seminoles.
5.The Boy Guide.55.Trapper Joe.
6.War Tiger of the Modocs.56.The Indian Queen's Revenge.
7.The Red Modocs.57.Eagle-Eyed Zeke.
8.Iron Hand.58.Scar-Cheek, the Wild Half-Breed.
9.Shadow Bill, the Scout.59.Red Men of the Woods.
10.Wapawkaneta, or the Rangers of the Oneida.60.Tuscaloosa Sam.
11.Davy Crockett's Boy Hunter.61.The Bully of the Woods.
12.The Forest Avenger.62.The Trapper's Bride.
13.Old Jack's Frontier Cabin.63.Red Rattlesnake, The Pawnee.
14.On the Deep.64.The Scout of Tippecanoe.
15.Sharp Snout.65.Old Kit, The Scout.
16.The Mountain Demon.66.The Boy Scouts.
17.Wild Tom of Wyoming.67.Hiding Tom.
18.The Brave Boy Hunters of Kentucky.68.Roving Dick, Hunter.
19.The Fearless Ranger.69.Hickory Jack.
20.The Haunted Trapper.70.Mad Mike.
21.Madman of the Colorado.71.Snake-Eye.
22.The Panther Demon.72.Big-Hearted Joe.
23.Slashaway, the Fearless.73.The Blazing Arrow.
24.Pine Tree Jack.74.The Hunter Scouts.
25.Indian Jim.75.The Scout of Long Island.
26.Navajo Nick.76.Turkey-Foot.
27.The Tuscarora's Vow.77.The Death Rangers.
28.Deadwood Dick, Jr.78.Bullet Head.
29.A New York Boy Among the Indians.79.The Indian Spirit.
30.Deadwood Dick's Big Deal.80.The Twin Trappers.
31.Hank, the Guide.81.Lightfoot the Scout.
32.Deadwood Dick's Dozen.82.Grim Dick.
33.Squatty Dick.83.The Wooden-Legged Spy.
34.The Hunter's Secret.84.The Silent Trapper.
35.The Woman Trapper.85.Ugly Ike.
36.The Chief of the Miami.86.Fire Cloud.
37.Gunpowder Jim.87.Hank Jasper.
38.Mad Anthony's Captain.88.The Scout of the Sciota.
39.The Ranger Boy's Career.89.Black Samson.
40.Old Nick of the Swamp.90.Billy Bowlegs.
41.The Shadow Scout.91.The Bloody Footprint.
42.Lantern-Jawed Bob.92.Marksman the Hunter.
43.The Masked Hunter.93.The Demon Cruiser.
44.Brimstone Jake.94.Hunters and Redskins.
45.The Irish Hunter.95.Panther Jack.
46.Dave Bunker.96.Old Zeke.
47.The Shawnee Witch.97.The Panther Paleface.
48.Big Brave.98.The Scout of the St. Lawrence.
49.Spider-Legs.99.Bloody Brook.
50.Harry Hardskull.100.Long Bob of Kentucky.