collision, on their way, with the hind quarters of a horse stunned by the explosion. When they had gone half way, Moodie halted, and bethought him of Nicholas Wood. "Stop, laddie!" said he to Robert, "stop; we maun gang back and seek the maister." So they retraced their steps. Happily, no farther explosion took place. They found the master lying on the heap of stones, stunned and bruised, with his hands severely burnt. They led him to the bottom of the shaft; and he afterward took care not to venture into the dangerous parts of the mine without the protection of a Geordy lamp. The time that Robert spent at Killingworth as viewer's apprentice was of advantage both to his father and himself. The evenings were generally devoted to reading and study, the two from this time working together as friends and co-laborers. One who used to drop in at the cottage of an evening well remembers the animated and eager discussions which on some occasions took place, more especially with reference to the growing powers of the locomotive engine. The son was even more enthusiastic than his father on the subject. Robert would suggest numerous alterations and improvements in detail. His father, on the contrary, would offer every possible objection, defending the existing arrangements--proud, nevertheless, of his son's suggestions, and often warmed and excited by his brilliant anticipations of the ultimate triumph of the locomotive. These discussions probably had considerable influence in inducing Stephenson to take the next important step in the education of his son. Although Robert, who was only nineteen years of age, was doing well, and was certain, at the expiration of his apprenticeship, to rise to a higher position, his father was not satisfied with the amount of instruction which he had as yet given him. Remembering the disadvantages under which he had himself labored through his ignorance of practical chemistry during his investigations connected with the safety-lamp, more especially with reference to the properties of gas, as well as in the course of his experiments with the object of improving the locomotive engine, he determined to furnish his son with a better scientific culture than he had yet attained. He also believed that a proper training in technical science was indispensable to success in the higher walks of the engineer's profession, and he determined to give Robert the education, in a certain degree, which he so much desired for himself. He would thus, he knew, secure an able co-worker in the elaboration of the great ideas now looming before him, and with their united practical and scientific knowledge he probably felt that they would be equal to any enterprise.