SOLAR EADIATION ABBOT 



195 



-4 DAYS 



Figure 17. — Average march of departures of temperature at Williston, N. Dak., associ- 

 ated with rising and fallinR sequences of solar variation. Similar to curves in Figure 

 16. Note opposition as at Washington, but dotted and full curves usually inverted 

 from W'asliingtiin 



102992—32—14 



