Among the many friends in Europe and America to Whom my thoughts turn in grateful memory for their generous encouragement, I mention for especial thanks Mr. And Mrs. William D. Munroe, Whose charming hospitality in the Far North made many of these experiments possible; Herr Professor Josef Hofi'mann, of Die K. K. Kunstgewerbe Schule, in Vienna; Miss Virginia E. Graefi, for valuable help and suggestions; and to all The Givers of the Tool Chest.