92 Nebraska Agricultural Exp. Station, Research Bui. 6. 
In Table 25 the per cent increase or decrease from hour to 
hour in the transpiration and evaporation rate together with the 
accompanying fall or rise in the climatic factors is given for 1914. 
(The data are compiled from Table 24.) To illustrate: The 
average transpiration for the hour ending at 9 a. m. was 32 per 
cent greater than for the hour ending at 8 a. m. The transpiration 
from 9 to 10 a. m. was 50 per cent higher than that from 8 to 9 
a. m., and so on. This table shows the actual amount of change 
in the climatic conditions from hour to hour and the resultant 
effect upon the amount of transpiration and evaporation. 
Table 25. — The data of Table 2J+ 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 pre- 
ceding hour. The actual hourly increase or decrease in the 
weather factors is also given. Average for 30 days between 
July 11+ and August 22, 191 1+. 
Hour 
ending 
rer cent in- 
crease or de- 
crease in 
transpira- 
tion over 
previous 
hour 
Per cent in- 
crease or de- 
crease in 
evaporation 
over previous 
hour 
Rise or fall 
in tempera- 
ture over pre 
vious hour 
Rise or fall 
in relative 
humidity- 
over previous 
hour 
Rise or fall 
in wind veloc- 
ity over pre- 
vious hour 
Per cent 
Per cent 
Degrees F. 
Per cent 
Miles 
(1) 
(2) 
(3) 
(4) 
(5) 
(6) 
9 a. m. 
+32 
+ 60 
+4.3 
—7.4 
+ .9 
10 " 
+ 50 
+ 51 
+3.8 
—5.7 
+1.1 
11 " 
+29 
+29 
+3.1 
—4.4 
+ .2 
12 " 
+30 
+28 
+2.7 
—4.2 
+ .5 
1 p. m. 
+18 
+23 
+2.0 
—3.2 
+ .2 
2, » 
+ 8 
+ 3 
+ 1.3 
—2.6 
+ .5 
3 " 
— 1 
— 3 
+ .4 
—1.1 
— .2 
4 " 
— 3 
— 7 
— .2 
—1.2 
— .2 
5," 
—14 
—17 
—1.1 
+ .7 
— .5 
6 " 
—26 
—24 
—1.7 
+ 1.5 
— .2 
7 " 
—39 
—28 
—3.1 
+ 5.5 
—1.1 
8 " 
—52 
—37 
—3.4 
+6.4 
— .5 
From this table we can make the following deductions: 
1. During that part of the day when the transpiration rate 
was increasing (7 a. m. to 2 p. m.) there was an actual average 
increase from hour to hour in: 
Transpiration (per cent) ' 28.00 
Evaporation (per cent) 32.00 
Temperature (degrees F.) 2.90 
Relative humidity (per cent decrease) 4.60 
Wind velocity (miles per hour) 60 
