As Derrick, and Paul, accompanied by Mrs. Sterling, Helen, the mine boss, and burly Tom Evert, walked down to the little railway-station, the miners of the day shift were gathering about the mouth of the slope, and preparing to descend into the recently pumped-out workings. From them came many a rough but honest farewell shout to the boys who had endeared themselves to all the village. "Tak' care o' thysels, lads!" "We'll not forget ye, an' ye'll bear us in mind!" "Whene'er thee's tired o' city, coom back, an' ye'll find a welcome!" "Mind t' fire-damp i' t' city, lads, an' use naught but safeties!" "Good-by!" As long as they were within hearing the boys, shouted back such answers as, "We'll try to!" "Thank you, Ike! We won't forget you; never fear!" "Good-by all!" Then the train came along. A few loving words were hastily spoken, and they were off. The hard, grimy, perilous life of the breaker and the mine was left behind, and a new one of study, ambitious dreams, and successes was opening broadly before them. [Illustration: GOOD-BY TO THE COLLIERY] At first the boys were inclined to feel very homesick, and their conversation was only of the dear ones whom they had just left. Gradually the feeling wore off, as their attention was attracted by the grand scenery through which they were travelling. Paul revelled in the gorgeous coloring of the autumnal foliage which covered mountain, hill, and valley with splendid mantles of crimson and gold. As the train, following the picturesque windings of the Lehigh, crept along some mountain-side hundreds of feet above the low-lying bottom lands, his delight at the vast expanse of exquisite scenery unfolded before them knew no bounds. "I didn't know the world was so beautiful," he said to Derrick, with a sigh of deep content, as the vivid pictures of the grand panorama flashed rapidly by. Derrick shared this enthusiasm, though to a less extent. He was more interested in the various forms of mining operations which were to be seen on all sides. His continued exclamations of, "Oh, Paul! look at that new breaker," or, "Isn't that a capital idea for a slope?" at last attracted the attention of a middle-aged gentleman who, with a lady, occupied the seat immediately behind them. Finally he leaned forward, and, speaking to Derrick, said, "Excuse me; but as you seem to be familiar with mining operations, perhaps you will kindly tell me what the great black buildings, of which we now see so many, are used for?" "Why," answered Derrick, somewhat surprised that anybody should be ignorant regarding what to him were among the commonest objects of life, "those are breakers." Then seeing that the other was still puzzled, he explained, simply and clearly, the uses of breakers, and in a few minutes found himself engaged in earnest conversation with the stranger upon mining in general, and coal mining in particular. At last the gentleman said, "You seem to be as well informed on the subject as a miner."