PLATE XLII 
Experimental plots at Missouri Experiment Station: 
Fig. i.—Plot I> (right), unplowed, no crop, kept clean; plot E (center), unplowed, 
planted to cowpeas; plot F (left), plowed, planted to cowpeas. 
Fig. 2.—Plot G (right), plowed, no crop, artificially shaded; plot H (left), plowed, 
no crop, kept clean. 
(+ 4 &) 
