Plate 10.— Roots from Wheat plants similar to those of a, h, c. and d of Plate 9. 

 Season 1906. 



(a) Magnesia "20 per cent. ; (h) Magnesia "i8 per cent. : (c) Majjnesia 35 per cent. : 

 (rf) Magnesia "50 per cent. 



