Fig. 2. — Mean solar radiation values following maxima of different intensities. 



Si, Following maxima above 1.990 calories. S2, Following maxima of 

 1.980 ±: 10. 



6":i, Following maxima of 1.960 ± 10 calories. S4, Following maxima of 

 1.940 ± 10. 



6".-,, Same as Si, at time of sun-spot iriaximum. Sa, Same as 5i at time of 

 spot minimum. 



Si, Same as 6":: at time of sun-spot maximum. 5"s, Same as ^"2 at time of 

 spot minimum. 



