TABLES OF STATISTICAL DATA 197 



tables on August 14 are the means of the corresponding 

 figures for August 12, 13, 14, 15, and 16, in Tables I. and 

 III. ; while the figures for August 15 are the corresponding 

 means for August 13, 14, 15, 16, and 17. The five-day 

 means thus obtained are the data plotted in the curves 

 of Figs. Hand 15. 



