Launch. - Ald. Rogers was making preparations this morning to launch the "Ocean Eagle, one of the new vessels on his stocks. She is so nearly fitted out that little time will be required to put her in sailing condition. Capt. McKnight, as before noticed, is to take the command, - a sailor to the manor born, in whose hands the "Ocean Eagle will be cared for. The launch was to take place about 3 o'clock this afternoon. The other vessel on the stocks west of the pier, Mr. Rogers intends launching in the latter part of the week. Capt. Stearns is to sail her.