24 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. J'J 



Solar Radiation telow 1.911 {^ja below normal) 

 Pressure 3 days later Winter half year 



JL ( I L 



Solar Radiation 1.921-30 fl^^ below normal) 

 Pressure 3 days later Winter half year 



Solar Radiation 1.931-40 (o,5% below normal) 

 Pressure 3 days later Winter half year 



Fig. i6. — Mean pressure deviations from normal following dif- 

 ferent intensities of solar radiation in steps below 1.941, winter 

 half-year. Units in hundredths of an inch. Three days later. 



