68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 79 



SAN SALVADOR 

 Authority. 



Observatorio Nacional Meteorologico de San Salvador. 



MEXICO 

 Authority. 



Servicio Meteorologico de Mexico. 



MAZATLAN 

 Pressure. 



Elevation of barometer : 

 1 880- 1 888, 76 m. 

 1888-1891, 4 m. 

 1 891 -1 909, 75 m. 

 1909-1915, 78 m. 

 Means are all reduced to sea-level. 



MERIDA 

 Pressure. 



Elevation of barometer : 



1 894- 1 905. 15 m- 

 1905-1917, 22 m. 

 Means are all reduced to 22 m. 



UNITED STATES 



Authority for Data. 



United States Weather Bureau, Climatological Division. 

 Hours of Observation. 



From Nov. i, 1870 to August 24. 1872, Observations were made 



at 7'' 35"', 16^ 35"" and 23'' 35'", Washington time. 

 From Aug. 25, 1872 to Oct. 31, 1879, 01)servations were made 



at 7^' 35™, 16" 35'" and 2^^. Washington time. 

 From Nov. i, 1879 ^o Dec. 31, 1884, Observations were matle at 



f\ 15'^ and 23'^ Washington time. 

 From Jan. i, 1885 to Dec. 31, 1886, Observations were made at 



7'\ 15'' and 23'\ 75th Meridian time. 

 From Jan. i, 1887 to June 30, 1888, (Observations were made at 



7'', 15^ and 22^, 75th Meridian time. 

 July I, 1888 to the present time, Oliservations were made at 8'' 



and 2o'\ 75th Meridian time. 



