TRANSACTIONS OF SECTION A. 



463 



Table showing heights of Elbe. 

 (0-5) (1-5) (2-6) (3-5) (4-5) (5-5) (6-5) (7-5) (8-5) (9-5) riO-6) (11-5). 



First 6. 

 + 0-85 -t- 1-00 + 1-64 + 1-25 + 0-52 -0-38 -0-82 -1-56 -2-16 -1-28 + 004 + 0-90. 



Second 6. 

 + 3-21 + 4-53 + 2-89 + 0-78 - 1-38 - 2-03 - 1-07 - 0-48 - 1-68 - 2'93 - 2-68 + 0-81 . 



Table showing heights of Seine. 



First 5. 



+ 1-84 + 1-57 + 1-25 -0-02 -0-54 + 0-09 -0-26 -0-82 -2-07 -1-56 -0-21 + 0-73. 



Second 5. 

 + 1-07 + 1-75 + 0-79-0-03-1-04-1-70-1-61-1-16-1-24-0-13 + 0-45 + 2-15. 

 Without entering into minute particulars aa to the details of the method by 

 which these tables have been obtained, it may be stated that they exhibit an 

 average oscillation in height something between a third and a quarter of a metre. 



It would appear from these tables that there is a maximum of river-height 

 about the time of maximum sun-spots, and another subsidiary maximum about 

 the time of minimum sun-spots. It is of interest to know Avhether the same 

 behaviour is followed by the river Nile. Through the kindness of General Stone 

 Pacha, and through the Science and Art Department, South Kensington, inform- 

 ation has been obtained about this river. This information is of two kinds one 



part of it refers to the yearly heights of the Nile, reckoned above the zero of the 

 Cairo Nilometer, the other to the date of maximum rise. 



This information has been embodied in the following tables:— 



Yearly lieights of the Nile. 



