entrance. In another moment he found himself rapidly descending the steep steps of the travelling-road, and feeling that the attempt to keep pace with the long-limbed fellows ahead of him must certainly result in his pitching headlong into the unknown depth of blackness.
The travelling-road was a gigantic stairway, leading at a steep angle directly down into the earth. It was high enough for a man to stand upright in without hitting his head against the roof, and it was provided with steps. They were cut or dug out of the rock, earth, or coal down through which the road passed, and were very broad and very high. The front edge of each was formed of a smooth round log. From the roof and sides of the road dripped and trickled little streams of water that made everything in it wet and soggy, and rendered the edges of the steps particularly slippery.
The air in the road was chilly in comparison with that of the warm summer's morning in which the outside world was rejoicing, and Derrick shivered as he first encountered its penetrating dampness. Of course the darkness was intense, but at first it was partially dispelled by the lights of the half-dozen miners in whose company he had entered the road. As they gradually left him behind, their twinkling lights grew fainter and fainter, until at last they vanished entirely, and Derrick found himself stumbling alone down the apparently interminable stairway.
While yet in company with the miners, he had passed through one door made of heavy planks, that completely closed the road, and now he came to another. Through its chinks and cracks there was a rush of air from outside inward that hummed and whistled like a small gale. It took all of Derrick's strength to pull this door open, and it closed behind him with a crash that reverberated in long, hollow echoes down the black depths before him.
Some distance below he was startled by a heavy booming sound from above, which was followed by a tremendous clattering, mingled with shouts and cries. In the first of these sounds he recognized the closing of the door through which he had recently passed, but he could not account for the others.
They were continued, and grew louder and louder as they approached, until at length they were close at hand, and he saw lights and a confused mass of struggling forms directly above him. Stepping to one side, Derrick flattened himself against the wall to let them pass; but just as the miner who came first reached that point, he tossed the end of a rope into the boy's hands, saying, "Here, lad, lead this mule down the rest of the way, will ye? I'm in a powerful hurry myself."
In another instant he had gone, leaping with immense strides down the precipitous steps, and Derrick found himself staring into the comical face of a large mule which, with his fore-feet on one step and his hind ones on that above, looked as though he were about to stand on his head.
"Go on, can't yer!" called out an impatient voice from behind the mule. "Do ye think I can hang onto this 'ere blessed tail all day? A mule's no feather-weight, let me tell yer."
Then Derrick realized that another man held the mule by the tail, and was exerting all his strength to prevent him from going down too fast. Accepting the situation, he started ahead, encouraging the mule to follow; but this arrangement did not seem to suit the animal, for he refused to budge a step from where he stood, nor could the man in the rear push him along.
"Here, you!" the man called out to Derrick, "come back here and steer him while I take his head. When he gets started, hang on to his tail with all your might, and hold back all yer can."
So they changed places, and the mule was so greatly pleased at having got his own way that he began to plunge down the stairs with great rapidity. Derrick felt almost as though he were being rushed through space on the tail of a comet, and shuddered to think of the broken limbs and general destruction that must inevitably follow such reckless travelling. The mule, however, seemed to know what he was about as well as the man who led him, and took such good care of himself that Derrick soon plucked up courage, and even began to enjoy the situation.
As he was thinking that they must be somewhere near the centre of the earth, the mule gave an unusually violent plunge forward, and then stopped so suddenly that poor Derrick found himself sprawling on the animal's back, with both arms clasped tightly about his neck. With this the mule began to caper and shake himself so violently that the boy was forced to loose his hold and fall to the ground, amid roars of laughter from a score of miners who witnessed the scene.
Greatly confused, Derrick scrambled to his feet, gave a reproachful glance at the mule, which was calmly gazing at him with a wondering look in his wide-open eyes, and turned to see in what sort of a place he had been so unceremoniously landed. At the same moment Mr. Jones, dressed in miner's costume, and looking as grimy as any of the others, stepped from the laughing group and said,
"My boy, I congratulate you on being the first person who ever rode into this mine on mule-back, I am glad you found the travelling-road so good. Came on your own mule too. How did you know this was the bumping-mule you were to drive?"
"I didn't know what sort of a mule he was until just as we got here and he bumped me off his back," replied Derrick; "and I begin to think that he knows more about driving than I do."
"Well, you have made a notable beginning," said the mine boss, "and I am sure you two will get along capitally together. Harry Mule, this is Derrick Sterling, who is to be your new driver, and I want you to behave yourself with him." Then to Derrick he said, "Harry has the reputation of being the most knowing, and at the same time the most perverse, mule in the mine. I believe though he only shows bad temper to those who abuse him, and I have selected you to be his driver because I know you will treat him kindly, and give him a chance to recover his lost reputation. If he does not behave himself with you, I shall put him in the tread-mill. Now stand there out of the way for a few minutes, and then I will show you where you are to work."
Derrick did as he was directed, and quickly found himself intensely interested in the strange and busy scene before him. The travelling-road entered the mine in a large chamber close beside the foot of the slope that led upward to the new breaker. From this chamber branched several galleries, or "gangways," in which were laid railway-tracks. Over these, trains of loaded and empty coal-cars drawn by mules were constantly coming and going. By the side of the track in each gangway was a ditch containing a stream of ink-black water, flowing towards a central well in one corner of the chamber, from which it was pumped to the surface. Opposite to where he stood, Derrick saw the black, yawning mouth of another slope, which, as he afterwards learned, led down into still lower depths of the mine. The men around him were handling long bars of railroad iron, which they were loading with a great racket on cars, and despatching to distant gangways in which new tracks were needed. Two large reflector lamps in addition to the miners' lamps made the chamber quite bright, and with all its noise and bustle it seemed to Derrick the most interesting place he had ever been in. He was sorry when the mine boss called and told him to bring along his mule and follow him.
They entered one of the gangways, leading from the central chamber, which the mine boss said was known as Gangway No. 1. He also told Derrick something about his mule, and said that by its last driver, Bill Tooley, the poor animal had been so cruelly abused that he had sent it to the surface for a few days to recover from the effects.
"I guess he has recovered," said Derrick, "judging from the way he brought me into the mine."
They had not gone very far before they came to a closed door on one side of the gangway beyond which the mule absolutely refused to go, in spite of all Derrick's coaxings and commands.
"It is the door of his stable," said the mine boss, who stood quietly looking on, without offering any assistance or advice, waiting to see what the boy would do.
Tying the end of the halter to one of the rails of the track on which they were walking, Derrick started into the stable, where he quickly found what he wanted. Coming out with a handful of oats, he let the mule have a little taste of them; and then, loosening the halter, tried to tempt him forward with them. This plan failed, for Harry declined to yield to temptation, and remained immovable. Then Derrick turned a questioning glance upon the mine boss, who said,
"Never again hitch an animal to a track along which cars are liable to come at any moment. Now, why don't you beat the mule?"
"Oh no, sir!" exclaimed Derrick, in distress. "I don't want to do that."
"Neither do I want