SYNCHRONOUS ANNUAL VARIATIONS 
337 
setting aside a reasonable number of permanent stations for 
long series of fundamental work in meteorology, just as astrono 
mers dedicate certain observatories to fundamental star places 
upon which the National Ephemerides are based. Cordoba, in 
1875 1880 1885 1890 1895 1900 1905 
Fig. 70. Synchronism between the annual variations of the solar and 
terrestrial phenomena. 
Argentina, is such a first-class meteorological station, because, 
since 1870, the instruments have had the same natural exposure, 
and practically the same apparatus has been used continuously, 
subjected to numerous tests for normality. There is no station