CONTENTS 



PAGE 



I. The antitoxic action of certain nutrient and non-nutrient bases 



with respect to plants 121 



Review of general literature 121 



Scope of the investigation 125 



Method 126 



Relation between calcium and magnesium 127 



Review of important field work 127 



Review of some culture experiments 129 



Experimental work 134 



Relations between other bases 138 



Potassium and magnesium, sodium and magnesium. . 138 



Calcium and potassium 140 



Calcium and sodium 143 



Calcium and ammonium 145 



Sodium and ammonium 149 



Calcium and barium 149 



Magnesium and barium 151 



Potassium and barium 152 



Calcium, potassium, sodium, or magnesium, and 



strontium 153 



Sodium and potassium 157 



The influence of age of seedlings on toxic and antitoxic 



relations 159 



Calcium and barium 160 



Calcium and sodium 161 



Calcium and strontium 161 



Calcium and ammonium 162 



Discussion 163 



Summary 164 



Conclusions 165 



Bibliography 166 



117 



