The ornamental design for a lavatory, as shown and described.
In a preferred embodiment, the nature of this product is as a plumbing fixture in the form of a lavatory which is primarily useful for washing the body parts of humans.
FIG. 1 is a left, top, front perspective view of a lavatory embodying my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof; and,
FIG. 4 is a left side elevational view thereof, the right side elevational view thereof being a mirror image of the left side shown.