SIR WILLIAM FAIRBAIRN'S EARLY LOVE OF MECHANICS. -- It will readily be seen that a boy of eleven years, with all the activity and bustle of youth, if not engaged in some useful pursuit, is likely to do mischief.  Fortunately my inclination took a different turn.  After the first year's residence at Moy, my younger brother, Peter, then a child of fifteen months old, required a great deal of nursing, and as that duty devolved upon my eldest sister and myself, I managed, in order to relieve myself of the trouble of carrying him on my back, to make a little waggon with four wheels, and by attaching a piece of old rope, used to drag him in all directions, sometimes to a considerable distance from the farm.  The construction of the waggon was, however, a formidable undertaking, as I had no tools but a knife, a gimlet, and an old saw.  With these implements, a piece of thin board, and a few small nails, I managed to make a respectable waggon, which, though frequently out of repair, was nevertheless much better than could be expected.  The greatest difficulty was the wheels, which I surmounted by cutting sections from the stem of a small alder tree, and with a red-hot iron burnt the holes in the centre to receive the axle.  The success which attended this construction led to others of greater importance, which I continued to practice, and which my father encouraged the whole time we were in the Highlands.  In the formation of boats and ships I became an expert artificer, and was at once a "Jack-of-all-trades," having to build, rig, and sail my own vessels.  From shipbuilding, I proceeded to construct wind and water-mills, and attained such proficiency that I had five or six mills in operation at once.  They were all made with the knife.  The waterspout was composed of the bark of a tree, and the millstones were represented by round discs of the same material.  It is not for me to offer an opinion as to the influence these exercises had upon my future fortunes; I may leave others to form their own judgment. -- Life of Sir William Fairbairn, written by himself.