through the Post-office must be prepaid, or they will not bo attended to.■ TltE CABLE LAID I 1 csterday morning about 9 o'clock the Postmaster General received a to'egram from Heart’s Content continuing the gratifying intelligence that tlie laying of the Atlantic Cable had boon successfully accomplished that morning, tho Great Eastern and her tenders arriving off the harbour at eight o’clock. The news was re-tviveJin the city with enthusiastic pleasure, llusiness was at once almost generally suspended, the bells oi the Catholic Cathedral gave out a joylul chime, guns were popping in every direction, hunting floated everywhere, and the'streets became full H i It ^td and anxious ctnjuirers.— In the night there would have been a grand display of fire-works from the Colonial Building, but the cveur ing proving wet, it was postponed.The “ big ship n will remain a day or two to coal at Heart’s Content, and then proceed to endeavour to fish up tjjrf} broken cable, and if successful \jill submerge it like the other—t*as we shall have two Cables across the Atlantic. ^E W* T to Grat telegram received^ from Lo idon, through the Cable, dated yesterday, is the cheering otiq that a treaty lt;rt* peace had b*en en-\Cored into bv Austria and Prussia.T II I? rT^fii’nrpo ArnnpmTrti*VDs