CONTENTS 



PAGE 



Summary 143. 



Review of Literature on Freezing 149 



Effect of Sap Density on Temperature , 155 



Experiments on Seedlings of Zea Mays 158 



Kjeldahl-Gummingt Method for Estimation of Nitrogen 184 



Other Features that Influence the Freezing to Death of Plants . . 187 

 Effect of Previous Exposure to Temperature Slightly Above Kill- 

 ing Temperature .i 223 



Relation of Low Temperature to Peach Growing -*3& 



Varieties with the longest Rest Periods 269 



Effect of Vigor of Trees on Rest Periods 272 



Breeding Varieties Hardy under Missouri Conditions 288 



Killing of Apples 293 



Killing of Cherries and Plums 302 



Acknowledgments 303 



Bibliography 305 



