CONTENTS. 



Page. 

 Introduction 7 



Exhibit of pure and adulterated foods. By W. D. Bigelow 7 



Beet-sugar industry. By E. E. Ewell 14 



Exhibit of road-material laboratory. By Logan Waller Page 25 



ILLUSTRATIONS. 



Page. 

 PLATE I. Diagram of the floor plan of the north wing of the United States 



Government building, Pan-American Exposition _ Frontispiece. 



II. Fig. 1, abrasion machine; fig. 2, ball mill ___ 24 



III. Briquette machine 26 



IV. Impact machine 26 



5 



