In the " New York Tribune " of Saturday last, Darius Davison publishes a long advertisement about some new motive power which he has discovered, that is to save 90 per cent, of fuel. One such Power is enough at once; we hope he will bring it out soon, so as to give the public a view of it. We are prepared for the "Wooly Horse" whenever he makes his debut. Those sea captains who trust to good sails save 100 per cent, of fuel': Mr. Davison is therelore ten per cent, behind the old sea marks yet. The next discovery may be a power to make two pounds of coal for one used.