SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8^ 



Fig. 2. — Average trends of temperature and pressure at Washington corre- 

 sponding to average solar changes of o.8 per cent. The solar changes culminate 

 on the day " zero," hut weather effects sometimes occur much later. Weather 

 effects corresponding to rising solar radiation, full lines ; to falling radiation, 

 dotted. 



