The  Hills  Experiments. 
311 
1 
Fig.  2.— Influence  of  the  Iodides  and  Oxides  of  Manganese,  Potassium,  Sodium,  and  Lithium  on  Barley,  1903. 
A,  Untreated.  B,  Manganese  Iodide.  C,  Potassium  Iodide.  D,  Sodium  Iodide.  E,  Lithium  Iodide.  F,  Manganese  Oxide.  G,  Potassium  Oxide. 
