PLATE lo 



A. — Rape on soil A. The top row, reading from left to right, shows the soil pots 

 which received the same fertilizers as in Plate g, series A. The lower row, reading 

 from left to right, shows the sand pots which received the same fertilizers as in pots 

 in Plate 9, series A. 



B. — Rape on soil B. The top row, reading from left to right, shows the sand pots 

 which received the same fertilizers as in pots in Plate 9, series A. 



C. — Rape on soil C. The soil pots, reading from left to right, received the same 

 fertilizers as in pots in Plate 9, series A. 



