36 Journal of Agricultural Research voi. x.Nai 



was observed on the leaves of both milo and kafir, while in only two 

 observations was it noticeable on the leaves of com, and then it appeared 

 in only very small amounts. 



II, PERCENTAGS OF WATER 



The average percentage of water for both the days and nights was 70.7 

 for com, 69.9 for kafir, and 65.5 for milo. The average percentage of 

 water in the leaves during the 22 days was found to be 71.3, 70.3, and 



65.8 for com, kafir, and milo, respectively. Taken in the same order, 

 the average percentage of water during the 10 night periods was 70.2 

 69.6, and 65.3, a dift'erence between the night and day of i.i, 0.7, and 0.5 

 per cent, respectively, for the corn, kafir, and milo. The minimum per- 

 centage of water in the leaves during the day occurred from 11 a. m. to 

 5 p. m. In most cases the minimum percentage was reached between 

 1 and 3 p. m. In almost one-third of the cases the percentage of water 

 varied little, if any, from 11 a. m. to 3 p. m. The minimum percentage 

 of water in the leaves occurred at 3 p. m. more frequently than at any 

 other period. The average difference between the maximum and mini- 

 mum percentage of water in the leaves during the day was 3.5 for com, 

 3.2 for kafir, and 4.5 for milo. 



The maximum percentage of water in the leaves of the corn during 

 10 nights occurred 5 times at 5 a. m., 3 times at 3 a. m., and twice at 

 I a. m. For the same number of periods the milo leaves reached their 

 maximum percentage of water 7 times at 5 a. ra., once at 3 a. m., and 

 twice at i a. m. In 8 night periods the kafir leaves showed the greatest 

 percentage of water 5 times at 5 a. m., once at 3 a. m., and twice at i 

 a. m. The average difference between the minimum and maximum 

 percentage of water in the leaves during the night was, respectively, 

 3.0, 4.2, and 4.7 for corn, kafir, and milo. 



The average difference between the maximum percentage of water in 

 the leaves at night and the minimum percentage of water during the 

 day was found to be 5.4 for corn, 5.9 for kafir, and 6.0 for milo. 



111. PERCENTAGE OF WATER (dRY BASIS) 



For all the day and night periods the average percentage of water in 

 the leaves on a dry basis; or, in other words, the ratio of the weight of 

 water to the weight of dry matter was 251.2 for com, 234.5 ^or kafir, 

 and 1 95. 1 for milo. The average percentage of water on this basis for 

 all the day periods was 240.0, 218.2, and 183.1, respectively, for com, 

 kafir, and milo, while, in the same order, the average percentage during 

 the 10 nights was 256.8, 235.9, and 197.0. This made an average dif- 

 ference between the maximum and minimum percentage of water in 

 the leaves during the night and day of 16.8 for corn, 17.7 for kafir, and 



13.9 for milo. The average variation of the percentage of water on a 

 dry basis during the daylight hours was 39.5 for corn, 31.1' for kafir. 



