The great problem is at length solved. The air, as well as the earth and the ocean, has been subdued by science, and will become a common and convenient highway for mankind. The Atlantic has been actually crossed in a balloon! And this, too, without difficulty--without any great apparent danger--with thorough control of the machine--and in the inconceivably brief period of seventy-five hours from shore to shore! By the energy of an agent at Charleston, South Carolina, we are enabled to be the first to furnish the public with a detailed account of this most extraordinary voyage, which was performed between Saturday, the 6th instant, at 11 A.M. and 2 P.M. on Tuesday, the 9th instant, by Sir Everard Bringhurst, Mr. Osborne, a nephew of Lord Bentinck; Mr. Monck Mason, and Mr. Robert Holland, the well-known aeronauts; Mr. Harrison Ainsworth, author of “Jack Sheppard,” _et cetera_, and Mr. Henson, the projector of the late unsuccessful flying-machine--with two seamen from Woolwich--in all, eight persons. The particulars furnished below may be relied on as authentic and accurate in every respect, as with a slight exception they are copied verbatim from the joint diaries of Mr. Monck Mason and Mr. Harrison Ainsworth, to whose politeness our agent is indebted for much verbal information respecting the balloon itself, its construction, and other matters of interest. The only alteration in the MS. received has been made for the purpose of throwing the hurried account of our agent, Mr. Forsyth, into a connected and intelligible form. The story that followed was about five thousand words in length. To summarize it, Monck Mason had applied the principle of the Archimedean screw to the propulsion of a dirigible balloon. The gas-bag was an ellipsoid thirteen feet long, with a car suspended from it. The screw propeller, which was attached to the car, was operated by a spring. A rudder shaped like a battledore kept the air-ship on its course. The voyagers, according to the story, started from Mr. Osborne’s home near Penstruthal, in North Wales, intending to sail across the English Channel. The mechanism of the propeller broke, and the balloon, caught in a strong northeast wind, was carried across the Atlantic at the speed of sixty or more miles an hour. Mr. Mason kept a journal, to which, at the end of each day, Mr. Ainsworth added a postscript. The balloon landed safely on the coast of South Carolina, near Fort Moultrie.