It is the machinery they use that is patented, we believe, and not the material; for there are many others in this branch of business. Mr. JOSEPH TALL, of London, has also a patent for a peculiar method of building in concrete, and has executed some contracts in Paris, where, in 1867, he took a prize at the Exposition. It is evident, then, that concrete is forcing its way, and that it is not an unworthy subject for the inventive minds of our astute countrymen. What we particularly need in order to give an impetus to construction in concrete is a well-systematized apparatus, movable and always available, and that men should be drilled to work to the greatest possible advantage; for it is the want of these requisites that makes concrete to-day a material so little known and so seldom used. Let an active company, with sufficient capital, start the business in any of our large cities, and concrete will soon assert its excellence as a building material, and an investment will be secured, giving profit to its holders and satisfaction to a very large section of our population, to whom economy must prove the key to comfortable independence. * * * * * The quarry companies in Connecticut were never doing a heavier business than this season. Three quarries now employ over one thousand laborers, seventy-five horses and one hundred yoke of cattle. A REMARKABLE CENTENARY. How few there are who pause for one instant from their plodding after the deified “Dollar,” to reflect that this present year, 1869, is the most remarkably commemorative of any yet on the Book of Time. It is now one hundred years since HUMBOLDT, CUVIER, the first BRUNELL, JAMES WATT, Jr., and Sir THOMAS LAWRENCE, among the most eminent of the world’s civilians—and NAPOLEON the First, WELLINGTON, SOULT and NEY, among the most advanced rank of mighty military chiefs, had birth. It is one hundred years since the elder WATT’S condensing steam engine was invented, and that invention which brought poverty with its production has, in these hundred years, revolutionized the globe, and made not alone individuals, but whole nations wealthy and powerful. No nation on the globe owes more to WATT’S steam engine than does this of ours. Where now would Civilization be coiled up? Where now would Science be secluded comparatively unnoticed and unknown—were it not for that one invention? The peoples of the world have been growing and multiplying, and where would have been the room, or the employment for the teeming millions, were it not for that happy thought which in 1769 became a palpable fact? A wise Providence was over all, and the brain that worked out the idea of the condensing steam engine was but doing its special part in the great work of civilization and progress. This Centenary is one which should not be allowed to pass unheeded, especially now that we have just drawn the extremes of the earth nearer, not alone to the ear, but to the eye itself.