10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 87 



monthly precipitation for Bismarck, North Dakota. These curves are 

 based solely on records extending from 1875 to 1920, and show the 

 expectation and the event from 1921 to 1932, a forecast and verifica- 

 tion covering 12 years. There is considerable similarity (especially 

 from 1 92 1 to 1926 in precipitation) between the forecasts and the 

 events. Yet it would, I feel, be premature to make extensive forecasts 

 of this character. I hope to press forward the investigation. 



I 



