Then he ran the Steam Man to the shores of a small lake and here, in a secluded spot, camp was made. No fires were lit, as it was not deemed best to risk attracting the attention of the enemy. The fires in the Steam Man were banked, and Pomp was elected to watch the first half of the night. Then Barney and Frank laid down and went to sleep. At midnight Barney was awakened and found Pomp ready to turn in. The Irishman had been on watch an hour when his attention was attracted by a singular manifestation. He could see the distant hill-tops against the sky. Suddenly upon the tiptop of one of these a red light was seen to be burning. It was fiery red and seemed to oscillate in an odd manner. “That is very quare!” muttered the Celt. “I wondher phwat it is?” The light remained in sight for several minutes describing various movements. At times it described a circle, then moved up and down and again waved back and forth. After the light disappeared Barney was pondering over the mystery when another light appeared upon a hill more to the eastward. This described movements exactly like the other. Then Barney’s quick wit fathomed the secret. “Bejabers, it’s tilegraphin’ back an’ forth they are,” he declared. “Och hone, now I wisht I cud rade whativer they be sayin’.” The Celt watched the lights with varying emotions. After a time they disappeared altogether. Nothing more worthy of note occurred that night. The next morning Barney related to Frank the details of the affair. “Indeed!” exclaimed the young inventor. “That is an important cue. No doubt the hills upon which you saw the lights are near the den of Costello.” “Well, sor, I kin point thim out to yez,” declared Barney. This was done, and a note of their position made. With the coming of another day Frank decided to make a cautious attempt to enter the hills with the Steam Man. Accordingly, steam was got up and the Man was sent along at a rapid gait toward the southern spur of the range. It required an hour to cross the plain at this point, it being quite a long ways. But finally the Steam Man reached this part of the range, and fortunately it was found that the mountain side here was clear and the Man could scale it. Frank started the Man up the incline, picking his way carefully. Thus far nothing could be seen of the greasers. If they were cognizant of the nearness of the Steam Man they did not show it. What their game was Frank was not prepared to say, but he kept a sharp lookout, fearing treachery. After climbing the mountain side for some time, the Man reached a spur, beyond which a good view of the interior country could be had. Here Frank called a halt for a brief time. With a glass he began to study the country beyond. In a few moments he gave an exclamation. “I believe I have discovered the den of the greasers,” he declared. “Shure, yez don’t mane it?” cried Barney.