To G.J. Lethem, London, for his translations from the Arabic;

Geoffrey Sephton, Vienna, for his nice co-operation;

L.P. de Bussy of the Koloniaal Institute, Amsterdam, Holland, for assistance rendered;

Burton Holmes and Blendon R. Campbell, New York, for courtesies;

John Cotton Dana, Newark, N.J., for assistance rendered;

Charles H. Barnes, Medford, Mass., for permission to publish the photograph of Peregrine White's Mayflower mortar and pestle;

Andrew L. Winton, Ph.D., Wilton, Conn., for permission to quote from his The Microscopy of Vegetable Foods in the chapter on The Microscopy of Coffee and to reprint Prof. J. Moeller's and Tschirch and Oesterle's drawings;

F. Hulton Frankel, Ph.D., Edward M. Frankel, Ph.D., and Arno Viehoever, for their assistance in preparing the chapters on The Botany of Coffee and The Microscopy of Coffee;

A.L. Burns, New York, for his assistance in the correction and revision of chapters XXV, XXVI, XXVII, and XXXIV, and for much historical information supplied in connection with chapters XXX and XXXI;

Edward Aborn, New York, for his help in the revision of chapter XXXVI;