The ornamental appearance of the bathing tub, as shown and described.
FIG. 1 is a top perspective view of the bathing tub showing the new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is section view taken along line 3 of FIG. 2 thereof; and,
FIG. 4 is a section view taken along line 4 FIG. 2.
The broken lines showing of the bottom, outside portions of the tub and the plumbing holes and fixtures are for illustrative purposes only and form no part of the claimed design.