We may here mention, in passing, that one of the most vividly-remembered incidents of James Watt’s boyhood was the Stuart rebellion of the “Forty-five,” which occurred when he was about ten years old. Watt himself is so intimately identified with the material progress of the nineteenth century, that it strikes one almost with surprise that he should have been a spectator, in however remote a degree, of incidents belonging to an altogether different age. The Stuart Rebellion may be said to have been the end of one epoch and the beginning of another; for certain it is that the progress of Scotland as an integral part of the British empire, and the growth of its skilled industry--which the inventions of Watt did so much to develop--appeared as if to spring from the very ashes of the rebellion. Like other lowland towns, Greenock was greatly alarmed at the startling news from the Highlands of the threatened descent of the clans. Sir John Shaw had the trades mustered for drill on the green in front of his mansion, and held them in readiness for defence of the town, in case of attack. Greenock was otherwise secure, being protected against the Highlands by the Clyde; besides, the western clans were either neutral or adhered to the house of Hanover. The Pretender with his followers passed southward by Stirling, and only approached Greenock on their return from England,--a half-starved and ill-clad, though still unbroken army. They halted at Glasgow, where they levied a heavy contribution on the inhabitants, and sent out roving parties to try their fortunes in the neighbouring towns. A small detachment one day approached Greenock, and came as near as the Clune Brae; but the townspeople were afoot, and on guard; signal was given to the ships of war moored near the old battery, and a few well-directed shots speedily sent the Highlanders to the right-about. The alarm was over for the present; but it was renewed in the following year, when the rumour reached Edinburgh that Prince Charles, hunted from the Highlands, had landed at Greenock, and lay concealed there. The consequence was that a strict search was made throughout the town, and Mr. Watt’s premises were searched like the others; but the Pretender had contrived to escape in another direction. Such was one of the most memorable incidents in the boy-life of James Watt, so strangely in contrast with the later events of his industrial career.