PLATE 



A. — Oats on sand cultures from soil A. 

 as in pots shown in Plate 9, series A. 



B. — Oats on sand cultures from soil B. 

 as in pots shown in Plate 9, series A. 



C. — Oats on sand cultures from soil C. 

 as in pots shown in Plate 9, series A, 



The sand pots received the same fertilizers 

 The sand pots received the same fertilizers 

 The sand pots received the same fertilizers 



