Mark Gildersleeve was almost an adopted son of the old physician, who had taken the youth in affection and proved an invaluable friend to him, chiefly by directing a course of reading and study. A priceless benefit this to Mark, whose advantages for instruction had been slight, for he had lost his parents at an early age, and been left to the care of his half-brother George, or rather to his half-brother's wife. It would have been difficult to find more dissimilar beings than these two brothers. George was the true son of Eben Gildersleeve, the tough old smith who could forge the best horse-shoe in the county; while Mark inherited the character and tastes of his mother, Eben Gildersleeve's second wife, a woman of beauty and delicacy, a rustic Venus mated to a village Vulcan. George was boisterous, given to bully and boast, and hid his purse-pride in an affected contempt for the world's opinion. Mark, on the contrary, was reserved, and rendered morbidly sensitive by a slight lameness resulting from an injury received in childhood--a mere blemish, though, in an otherwise well-knit and graceful form. For all his reserve the lad had a resolute and ambitious spirit. Gifted with quick perception, and a natural aptitude for mathematics, he had become, although almost self-taught, proficient as a mechanical engineer. After a common-school education, his brother, in accordance with the theory that the only road to success was through a diligent use of the flexors and extensors, set him to work in the shops, but it was not long before he was found to be more useful in the draughting room. Young as he was, Mark had introduced some valuable improvements in his brother's works, although that independent fellow was not over-ready to acknowledge it. On the contrary, he rather berated the young man behind his back, for a fop who cared for nothing but dress, or a fool who was occupied with dreams and poetry instead of devoting himself to his business. Mark, it must be admitted, sinned a little in that way, although not to an extent to justify his brother's railings. Full of enthusiasm and high aspirations, he scorned mere money-making, and as he earned enough to satisfy his wants he bestowed no further thought in that direction. This was a source of displeasure to George. "Confound the fellow," he would exclaim in the barber-shop, perhaps, or at Bird's livery stable, "Confound the fellow! he's no slouch, but as smart as they make 'em, and if he'd only stick to his work he'd be a rich man in time. I never had much of a head for figures, but it comes nat'ral to him. If he's a mind to, he can do more work than any other two men you can scare up, and if he aint a-mind, you can't coax or drive him. He'll go off and jingle away by the hour on a piano, like a girl, or play chess or read novels half the night. Why, he's even got a banjo up in his room that he strums away on like a nigger minstrel" (alluding to a Spanish guitar that Mark