A NEW MATERIAL FOR ROOFING.-We learn, from the Philadelphia Ledger, through the communication of a "Mechanic," that a new method for roofing houses has been invented by two gentlemen of that State, which is "more durable than shingles, slate, or tine, as brilliant as glass, fire-proof and water-proof; red, blue, green, or any other colour that may be desired; a non-conductor of electricity, a reflector of heat, cheaper than tin, lighter than slate; being vitrified, it is almost indestructible by time or weather and so easily put on that the largest roof can be put on in a single day, if desired. It requires very little descent; a roof covered with this material may be covered as flat as any tin roof without the least danger of leaking. Nothing short of actual violence will injure it. Should it come into general use our cities will out-shine the Kremlin of Moscow. When a house with a slate roof is on fire, the slates fly so that firemen are in danger should they come near ?***? this article, having passed through the fire ?***? process of manufacture, is not liable to this construction; its durability is such that it will last as long as the house."-Farmer & Mechanic.