U. S. Dept. of Agf., Bui. 1 26, Office of Expt. Stations. 



Plate II. 



Fig. 1.— Flour Particles from Graham Flour No. 243 i Magnified 15 Diameters). 



Fig. 2.— Feces from Bread Made from Straight Patent Flour (Magnified 15 



diameters). 



