Bui. 108. Bureau of Chemistry, U. 5. Dept. of Agriculture. 



PLATE IV. 



FIG. 1. EPIDERMAL LAYER OF SEED COAT OF Cow FIG. 2. BEADED CELLS NEAR HILUM OF SEED OF 



HERB. (X 150.) Cow HERB. (X 300.) 





FIG. 3. EPIDERMAL CELLS OF CORN COCKLE. 

 (X 75.) 



FIG. 4. EPIDERMAL CELLS OF JIMSON WEED 

 SEED. (X 75.) 







FIG. 5. EPIDERMAL CELLS OF SEEDS OF 

 BOUNCING BET. (X 150.) 



Fra. 6. EPIDERMAL CELLS OF SEED OF NIGHT- 

 BLOOMING CATCHFLY. (X 150.) 



