New Vessel. - A fine new vessel of the first class, built during the winter at the yard of Andrew Miller & Co., hauled up the stream this morning, with flying colors, and in complete order to sail. She is named the "Gilbert Mollison," and is owned by Mitchell Brothers and M. Murphy. Her saiuls were manufactured at the loft of H.W. Green, and the bright coating of paints was put on by Mr. P. Cullinan.