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IOWA ACADEMY OF SCIENCE 
Average daily departures from Normal Temperature for Crop Season 1901, March 
1-September 30. Shaded potions show excess ( + ), unshaded potions deficiency (— ) 
of temperature. Figures show mean daily excess ( + ) or deficiency ( — ) of tempera- 
ture over areas bounded by light lines. 
Mean Surface Temperatures for 1901. 
