LONGITUDE OP SUEZ. 



345 



EXCHANGE of G-ALVANIC SIGNALS between MOKATTAM and SUEZ, and INFERRED 



DIFFERENCE of LONGITUDE. 



We have, therefore, the following mean result for each day for the 

 Longitude of Suez, East of Mokattam : 



1874, Dec. 4 o. 5. 6-g7o 



5. ..... 6*goo 



7 6-6go 



14 6*g65 



