CONTENTS. 



SURJECT. PAGE 



Introduction 241 



Cultivated Plants , 241 



Critical periods of growth 243 



Agricultural rneteorology ^ 244 



Personal investigations 245 



Weather and the yield of corn 246 



Four greatest corn States 248 



The correlation coefficient (r) . 250 



The critical period for potatoes 255 



Weather and winter wheat 257 



Effect of snow covering on wmter wheat 259 



Snowfall and yield of winter wheat 259 



A few of the problems 260 



The value of such a service 202 



References 264 



