ILLUSTRATIONS. 
Puiare I. Tobacco from sand cultures (upper plants, excess of magnesia; lower 
plants; ‘excess: ol lime) Jae ea Bee Soe ee ace ee 
II. Oats in sterile magnesium soils rendered fertile by the addition of 
JOIN CSO ee De as a ee 
IIt. Fig. 1.—Wheat in sand cultures (pots from left to right ranging in 
MgO 0.8 to 0.1, CaO 0.1 to 0.8 per cent as nitrates). Fig. 2.—Cow- 
peas in soils showing effect ef variable applications of lime and 
MAGNESIA 228 Le Rohe Sad ate a Se cae eee neat a ee a 
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