INTERNATIONAL MONTHLY CHART. 



Showing men., pressure, mean temperature, mean force and prevailing direction of T cin<ls „, 



T:3S A. M., Washington mean time, for the month of April, 1878, based 



on the daily charts of the International Bulletin. 



PREVAILING WINDS 



111.1 U> 18.1 



ISOBARS AND ISOTHERMS. 



Isobars in blue; detached barometer i 

 in English inches. 



Isotherms in ml; detached temperature r 

 In degrees Fahrenheit. 



