Transpiration as a Factor in Crop Production. 7 
TABLE PAGE 
18. Coefficients of variability with total transpiration per 
plant in similar potometers planted with Hogue's 
Yellow Dent corn 82 
19. Coefficients of variability with water used per gram 
of dry weight of ear in similar potometers planted 
with Hogue's Yellow Dent corn 83 
20. Coefficients of variability with water transpired per 
gram of dry weight of crop in similar potometers 
planted with Hogue's Yellow Dent corn 84 
21. Coefficients of variability with water used per square 
inch of leaf -area in similar potometers planted with 
Hogue's Yellow Dent corn 85 
22. Summary showing coefficients of variability for 48 
similar potometers in 1912 and 80 potometers in 
1913 86 
23. Summary of transpiration, free- water-surf ace evapo- 
ration, and weather factors during successive hours 
of the day and night. 1910 88 
24. Summary of transpiration, free- water-surf ace evapo- 
ration, and weather factors during successive hours 
of the day and night. 1914 89 
25. The data of Table 23 are here so calculated as to 
show the per cent increase or decrease in the 
transpiration and evaporation rates for each hour 
of the day over those of the preceding hour. The 
actual hourly increase or decrease in the weather 
factors is also given. Average for 30 days. 1914 92 
26. Average relative day and night transpiration and 
evaporation rates during nine consecutive days in 
1910 and 30 days in 1914 94 
27. Relationship between the daily transpiration, evapo- 
ration, and climatic factors. 1910 96 
28. Relationship between the daily transpiration, evapo- 
ration, and climatic factors. 1914 97 
29. Relative daily transpiration from plants in different 
degrees of soil saturation. 1913 101 
30. Relative daily transpiration from plants in different 
degrees of soil saturation. 1914 102 
31. Weekly summary of transpiration from corn plants 
and weather factors thruout the growing season. 
1914 105 
32. Weekly summary of water transpired thruout the 
growing season by corn plants growing in four 
different degrees of soil saturation. 1914 106 
