104 ANNUAL KEPORT SMITHSONIAN INSTITUTION, 19 3 5 



YEARS OF CYCLE 

 5 lO 15 20 



YEARS OF CYCLE 

 5 lO 15 20 



1 1.0 

 LOW STAGE OF THE NILE RIVER 



FiauHB 8. — Low-level stages of the Nile River. Showing 23-year periodicity, A. D. 725- 



1424 and A. D. 1839-1885. 



