68 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



YEARS OF CYCLE 

 5 10 15 20 



YEARS OF CYCLE 

 5 10 15 20 



LOW STAGE OF THE NILE RIVER 



Fig. 28. — Low-level stages of the Nile River. Showing 23-year periodicity, 

 A. D. 725-1424, and A. D. 1839-1885. See description in text. 



