While inventors owe their talents to nature, these talents need sound training, if at a master’s hands, so much the better. Just as the best place to learn how to paint, is the studio of a great artist, so the best school for ingenuity is the workshop of a great inventor. Maudslay, who devised the slide-rest for lathes, and Clement, who designed the first rotary planer, were trained by Bramah, who invented the famous hydraulic press, and locks of radically new and excellent pattern. Whitworth, who created lathes of new refinement, who established new and exact standards of measurement in manufacturing, was trained by Maudslay; so was Nasmyth, who devised the steam hammer. Mr. Edison in his laboratory and workshop has called forth the ingenuity of many an assistant who has since won fame and fortune by independent work. But as a rule inventors, like the vast brotherhood of other men, must toil by themselves, and get what good they can out of unaided diligence. Cobbett used to say that he thought with the point of his pen; the very act of writing lifted into consciousness many an idea which otherwise had died stillborn. Beethoven, like all other great tone-poets, would play a few bars as they came to his imagination, and while he touched the keys the music, as if with pinions of its own, took such heavenly flights as those of the Fifth Symphony. In just this mode while an inventor is shaping a new model he feels how he can better its lines, give it a simpler design than he first intended. His hands and eyes think as well as his brain; while lever, link, and cam unite together they suggest how they may be more compactly built, more effectively joined. His partner, the discoverer, is under the same spell with regard to some long-standing puzzle of rock, or plant, or star. Because in his soul he believes nature to be intelligible to her very core, he is sure that this particular puzzle can be fathomed, and he keeps thinking day by day of possible solutions. At other times, and even during sleep, his brain is subconsciously at work upon his problem, bringing to view promising points for attack. With new light he is bold enough to say, this problem can be solved by me. At last dawns the happy morning when he verifies a shrewd guess, or when a crucial experiment stamps a theory as proven truth, indispensable aid having arisen as one attempt, through baffling failure, suggested the next. All boys and girls are the better, happier, more useful when they are early and thoroughly trained to use their eyes, ears, and hands; to the inventor and discoverer this training opens a career which otherwise is denied. Among the greatest of the sons of men who have united the faculties of invention and discovery stands Sir Isaac Newton. As with his compeers we find that his art as an inventor was but the flower of his handicraft as a mechanic. Sir Isaac Newton almost from the cradle was a builder. His biographer, Sir David Brewster, says:--