PLATE 49 
A. —Oats, showing growth with potash from various minerals, with and without 
calcium carbonate. 
B. —Soybeans, showing growth with potash from various minerals, with and with¬ 
out calcium carbonate. 
C. —Rye, showing growth with potash from various minerals, with and without 
calcium carbonate. 
D. —Cowpeas, showing growth with potash from various minerals, with and with¬ 
out calcium carbonate. 
(316) 
