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. 



