CULTURE OF THE SUGAR BEET. 



Average humidity in Belgium for the different months. 



37 



Relation between the numbers of years above the average and those below it. 



Number of rainy days for the different months — average of a series of years. 



Relation between the number of years for ichich the recorded figures are above the average and 

 below it, as shown by the observations of a number of years. 



