A PAIR OF GERMAN STILL-LIFE REVERSE PAINTINGS ON GLASS by J.C. Vogel, one depicting a flower-painted white ceramic bowl laden with peaches and flanked by a primula upon a blue, swagged ledge, the other depicting a basket, cherries, plums and apricots with a baluster rim with tulips and violets resting upon a similar ledge, both signed lower right 'J.C. Vogel', in brown-painted gilt-composition frames, 19th century