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REPORT — 1878. 



Table XIV. — Depths of Rivers.— Minimum years in 7th line. 



The lowest level is attained two years after the mean year of mini- 

 mum sunspots. 



The mean of the mean cycle is 6 ft. 2'6 inches, and for the years 1804 

 to 1871 the mean level is 6 ft. 36 inches. 



30. Taking the Elbe alone, we get the following results : — 



Table XV. — Depths of the Elbe. — Maximum years in 6th line. 



The mean maximum level (6 ft. 8 - 7 inches) is attained soon after the 

 maximum sunspots. 



The mean depth for the mean cycle is 6 ft. 1*0 inches, and for the 

 whole period 6 ft. 2'2 inches. 



31. The converse arrangement gives the following results for the 

 Elbe :— 



The lowest mean level occurs about two years after the epoch of 

 minimum sunspots (as in Table XIV.), and there is a considerable 

 amount of overlapping, the river lagging behind the sunspots. 



