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; George W. Lawrence, former president, and T.S.B. Nielsen, president, of the New York Coffee and Sugar Exchange, for their assistance in the revision of chapter XXXI; Helio Lobo, Brazilian consul general, New York; Sebastiao Sampaio, commercial attache of the Brazilian Embassy, Washington; and Th. Langgaard de Menezes, American representative of the Sociedade Promotora da Defeza do Cafe; Felix Coste, secretary and manager, the National Coffee Roasters Association; and C.B. Stroud, superintendent, the New York Coffee and Sugar Exchange, for information supplied and assistance rendered in the revision of several chapters; F.T. Holmes, New York, for his help in the compilation of chronological and descriptive data on coffee-roasting machinery; Walter Chester, New York, for critical comments on chapter XXVIII. The author is especially indebted to the following, who in many ways have contributed to the successful compilation of the Complete Reference Table in chapter XXIV, and of those chapters having to do with the early history and development of the green coffee and the wholesale coffee-roasting trades in the United States: George S. Wright, Boston; A.E. Forbes, William Fisher, Gwynne Evans, Jerome J. Schotten, and the late Julius J. Schotten, St. Louis; James H. Taylor, William Bayne, Jr., A.J. Dannemiller, B.A. Livierato, S.A. Schonbrunn, Herbert Wilde, A.C. Fitzpatrick, Charles Meehan, Clarence Creighton, Abram Wakeman, A.H. Davies, Joshua Walker, Fred P. Gordon, Alex. H. Purcell, George W. Vanderhoef, Col. William P. Roome, W. Lee Simmonds, Herman Simmonds, W.H. Aborn, B. Lahey, John C. Loudon, J.R. Westfal, Abraham Reamer, R.C. Wilhelm, C.H. Stewart, and the late August Haeussler, New York; John D. Warfield, Ezra J. Warner, S.O. Blair, and George D. McLaughlin, Chicago; W.H. Harrison, James Heekin, and Charles Lewis, Cincinnati; Albro Blodgett and A.M. Woolson, Toledo; R.V. Engelhard and Lee G. Zinsmeister, Louisville; E.A. Kahl, San Francisco; S. Jackson, New Orleans; Lewis Sherman, Milwaukee; Howard F. Boardman, Hartford; A.H. Devers, Portland, Ore.; W. James Mahood, Pittsburgh; William B. Harris, East Orange, N.J. New York, June 17, 1922. [Illustration] FOREWORD _Some introductory remarks on the lure of coffee, its place in a rational dietary, its universal psychological appeal, its use and abuse_