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. 23, 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 g. 

 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 cc. Transpiration for this 

 hour was 1.83 g. and absorption was 1.79 g. 



(7) Nov. 16, clear sky. Dark red Coleus plant. Transpiration 

 was greater than absorption for the period 9:45 a. m. to 3:45 p. m., 

 incipient drying amounting to 0.89 g. Absorption was greater 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 



