The ornamental design for a fountain, as shown and described.
FIG. 1 is a front elevation of the fountain of hte present invention. The
dotted lines in this view and in FIGS. 2, 4 and 5 illustrate an example of
the surface over which the water may flow into the basin of the fountain
and forming no part of the claimed design.
FIG. 2 is a top plan view.
FIG. 3 is a bottom plan view.
FIG. 4 is a rear elevation. The left side elevation and right side
elevation are identical to this view; and,