CORK Jacket, or Waistcoat, is an invention of one Mr Dubourg, a gentleman very fond of swimming, but subject to the cramp, which led him to consider of some method by which he might enjoy his favourite diversion with safety. The waistcoat is composed of four pieces of cork, two for the breasts, and two for the back; each pretty near in length and breadth to the quarters of a waistcoat without flaps; the whole is covered with coarse canvas, with two holes to put the arms through: there is a space left between the two back pieces, and the same betwixt each back and breast piece, that they may fit the easier to the body. Thus the waistcoat is open only before, and may be fastened on the wearer with strings, or, if it should be thought more secure, with buckles, and leather straps. This waistcoat does not weigh above 12 ounces, and may be made up for about 5 or 6 shillings expence. Mr Dubourg tried his waistcoat in the Thames, and found that it not only supported him on the water, but that two men could not sink him, though they used their utmost efforts for that purpose. If those who use the sea occasionally, and especially those who are obliged to be almost constantly there, were to have those waistcoats, it would be next to impossible that they should be drowned. It would also be of vast service to those that, for the sake of health, bathe in the sea; and even the most delicate and timorous young lady might by the help of one of these jackets venture into a rough sea. See AIR-Jacket, and BAMBOO-Habit.