Mezzo-tinto is said to have been first invented by Prince Rupert, about the year 1649: going out early one morning, during his retirement at Brussels, he observed the sentinel, at some distance from his post, very busy doing something to his piece. The prince asked the soldier what he was about? He replied, the dew had fallen in the night, had made his fusil rusty, and that he was scraping and cleaning it. The prince, looking at it, was struck with something like a figure eaten into the barrel, with innumerable little holes, closed together, like friezed work on gold or silver, part of which the fellow had scraped away. The _genie second en experiences_ (says Lord Orford), from so trifling an accident, conceived mezzo-tinto. The prince concluded, that some contrivance might be found to cover a brass plate with such a ground of fine pressed holes, which would undoubtedly give an impression all black, and that, by scraping away proper parts, the smooth superfices would leave the rest of the paper white. Communicating his idea to Wallerant Vaillant, a painter, they made several experiments, and at last invented a steel roller with projecting points, or teeth, like a file, which effectually produced the black ground; and which, being scraped away or diminished at pleasure, left the gradations of light. Such was the invention of mezzo-tinto, according to Lord Orford, Mr. Evelyn, and Mr. Vertue. [1] The word mezzo-tinto is derived from the Italian, meaning half painted. P. T. W. * * * * * RETROSPECTIVE GLEANINGS. * * * * * [For the following succinct account of the Gunpowder Conspiracy, our acknowledgments are due to the proprietors of an elegant and interesting _Annual_, entitled "THE AMULET" for 1828.] A BRIEF HISTORY OF "THE GUNPOWDER PLOT." _(Compiled from original and unpublished documents.)_ Of all the plots and conspiracies that ever entered into the mind of man, the Gunpowder plot stands pre-eminent in horror and wickedness. The singular perseverance of the conspirators is shown by the fact, that so early as in Lent of the year 1603, Robert Catesby, who appears to have been the prime mover of the plot, in a conversation with Thomas Wintour and John Wright, first broke with them about a design for delivering England from her bondage, and to replant the Catholic religion. Wintour expressed himself doubtful whether so grand a scheme could be accomplished, when Catesby informed him that he had projected a plan for that purpose, which was no less than to blow up the Parliament House with gunpowder.