Brush

1 . 1 is a front elevational view of the brush, showing my new design; 1 . 2 is a back elevational view thereof; 1 . 3 is a right side view thereof; 1 . 4 is a top plan view thereof; 1 . 5 is a bottom plan view thereof; 1 . 6 is a perspective view thereof; 1 . 7 is a perspective view thereof, shown with bristles retracted; 1 . 8 is a left side view of 1 . 1 ; 1 . 9 is another perspective view thereof; and 1 . 10 is an enlarged view taken from line 1 . 10 in 1 . 6 . The broken lines shown in the drawings depict portions of the brush that form no part of the claimed design. The additional dot-dash broken lines in 1 . 6 and 1 . 10 are for the purpose of showing enlarged areas and form no part of the claimed design.