Bul. 1, Bureau of Plant Industry, U. S. Dept. of Agriculture. PLATE III. 
Fig 1.—WHEAT IN SAND CULTURES. 
Pots from left to right ranging in MgO 0.8 to 0.1, CaO 0.1 to 0.8 per cent as nitrates. 
FiG. 2.—COWPEAS IN SO!ILS SHOWING EFFECT OF VARIABLE APPLICATIONS OF LIME AND 
MAGNESIA. 
