Glen had visited the bridge so often that the engineer knew him by sight, and had even learned his name, though he had never spoken to him. He was, however, especially fond of boys, and had been much pleased with Glen's appearance. Several times he had been on the point of speaking to him, but had been restrained by the diffidence a man is so apt to feel in the presence of a stranger so much younger than himself. It is a fear that he may do or say something to excite the undisguised mirth or contempt that so often wait upon the ignorance of youth.