HARTZ, Joseph Michael (1836 ? 1903). Table Mat from Hartz?s Devil of a Hat Production. Circa 1880s. Heavily embossed thick paper table mat from Hartz?s famous routine in which a seemingly endless quantity of solid objects were produced from a borrowed hat. Diameter 6 5/8?. Cracked chipped, and worn, but intact. A label affixed to the rear of the mat bears a holograph note in the hand of George Johnson, editor and publisher of The Magic Wand, which states: ?This mat is one of some half-dozen used by Hartz in his Devil of a hat act. The mats were used to support lighted lanterns. G.J.? Beneath the note in another hand is the statement, ?Given to Bayard Grimshaw by George Johnson.?