12 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 71 



Curve S2 shows a plot of the mean radiation vahies following and 

 preceding" solar maxima of 1.980 calories and shows that there were 

 succeeding maxima at intervals of ahout seven days. The remaining 

 curves do not show sufifiicient regularity to detect periodic waves with 

 certainty, but there appears no doubt from these results that the 

 successive temperature waves found in the temperature at Buenos 

 Aires had their origin in periodic waves of the same kind in solar 

 radiation. 



Comparison Between the Means of Solar Radiation and 

 THOSE of Air Temperaturf 



The relation between the means of solar radiation and those of air 

 temperature at Buenos Aires becomes more evident from figure 3 



Fig. 3. — Comparison of solar radiation and temperature of Buenos Aires. 

 Sa and So, Mean solar radiation values following maxima above 1.990. 

 Ti and To, Temperatures at Buenos Aires following maxima above 1.990. 

 .^5 and Ti, At time of sun-spot maximum. So and 7j, At tinfe of minimum. 



where the curves 65 and S6 are compared with the mean temperature 

 at Buenos Aires following the larger maxima of solar radiation 



