PLATE LXXXVI 



Fig. i. Comparative growth of soybeans in brown silt loam and dolomite, showing 

 that the loam would have been improved by the addition of some limestone or 

 dolomite. 



Fig. 2. Soybeans in sand treated with magnesium, showing that their growth 

 increases inversely with the quantity of magnesium applied as sulphate. 



