180 Drying and Wilting of Plants [378 
tion was 1.36 g. and absorption was 1.28 g. Transpiration for the 
last hour of incipient drying was 1.26 g. and absorption was 1.18 g. 
No permanent wilting occurred. . 
(3) Sept. 238, cloudy or partly cloudy. Buckwheat plant. Ab- 
sorption was greater than transpiration for the period 6:50 to 7:20 
a. m., the plant gaining 0.03 g. Transpiration and absorption were 
equal (0.08 g.) for the period 7:20 to 7:50 a, m. Transpiration was 
greater than absorption for the period 7:50 a. m. to 2:20 p. m., incipi- 
ent drying amounting to 0.59 g. Wilting began during hour ending 
10.20, when incipient drying amounted to 0.33 g. Transpiration 
for this hour was 0.56 g. and absorption was 0.44 g. Transpiration 
and absorption for the period of incipient drying (7.50 to 9.20 a.m.) 
were 0.67 and 0.46 g.; for the last period of incipient drying (12.30 
to 2.20 p.m.) they were 1.49 and 1.43 g., respectively. Three out 
of five leaves were permanently wilted and never recovered. 
(4) Nov. 3, clear sky. Dark red Coleus plant. Transpiration and 
absorption were equal (0.29 g.) for the hour 7:30 to 8:30 a. m. 
Transpiration was greater for the period 8:30. to 11:30 a. m., incipi- 
ent drying amounting to 0.35 g. Absorption was greater for the 
period 11:30 a. m. to 7:30 p. m., the plant gaining in weight 0.68 g. 
Transpiration and absorption were equal (0.16 g.) for the period 
7:30 to 9:30 p.m. No wilting was noted. The evaporating power 
of the air was 1.02 cc. (per hour, from the Livingston standard 
white spherical atmometer) for the first hour of incipient drying. 
Transpiration for this hour was 0.76 g. and absorption was 0.70 g. 
(5) Nov. 4, cloudy. Dark red Coleus plant. Transpiration and 
absorption were equal (0.11 g.) for the period 5:30 to 7:30 a. m. 
Transpiration was greater for the period 7:30 a. m. to 2:30 p. m,, 
incipient drying amounting to 0.47 g. Absorption was greater for 
the period 2:30 to 5:30 p. m., the plant gaining in weight 0.10 ¢. 
No wilting was noted. The atmometric index for first hour of 
incipient drying was 0.33 cc. Transpiration for this hour was 0.10 
g. and absorption was 0.01 ¢g. 
(6) Nov. 16, clear sky. Two buckwheat plants bound together 
at base. Transpiration was greater than absorption for the period 
9:30 to 11:30 a. m., incipient drying amounting to 0.17 g. Absorp- 
tion was greater for the period 11:30 a. m. to 10:30 p. m., the plants 
gaining in weight 0.33 g. No wilting was noted. Atmometric index 
for last hour of incipient drying was 0.9 ee. Transpiration for this 
hour was 1.83 g. and absorption was 1.79 ¢. 
(7) Nov. 16, clear sky. Dark red Coleus plant. Transpiration 
was greater than absorption for the period 9:45a.m. to 3:45 p. m., 
incipient drying amounting to 0.89 g. Absorption was ercater than 
transpiration for the period 3:45 to 7:45 p. m., the plant gaining 
in weight 0.78 g. No wilting was noted. The atmometric index 
