Jul. 1 17, Bureau of Chemistry, U. S. Dept. of Agriculture. 



PLATE III. 



FIG, 1. TAMARISK (TAMARIX AFRICANA), SHOWING PAPILL/C OF 

 EPIDERMIS. X150. 



FIG. 2. SMOOTH SUMAC (Rnus GLABRA). UPPER SURFACE. xi50. 



