Mar. 8 . 1924 Carbohydrate Variations in Corn and Sorghum Leaves 801 
AM PM AM. 
7 9 /1 1 3 5 7 9 II I 357 
The data in regard to the amount of water, dry matter, and carbohy¬ 
drates obtained in each of the experiments are shown in Tables IV to IX. 
The results are expressed in percentages and in terms of the number of 
grams of constituents per square meter of leaf. The percentages of water 
and dry matter are calculated on a wet basis, while the percentages of 
carbohydrates are estimated on the amount of dry matter in the leaf. 
The changes in the amount of the constituents per square meter of leaf 
during each two-hour period of the experiments are shown by graphs in 
figures 1 to 6. 
DRY MATTER AND WATER IN THE LEAVES 
The daily variation of the water and dry matter in the leaves of corn 
and the sorghums has been reported in detail in a previous paper (jo), 
so that only those facts will be mentioned that are essential to discussion 
of the variation of the carbohydrates of the leaves. 
In the experiments the amount of dry matter in a given area of leaf 
was always greater for the sorghums than for the corn, and a microscopic 
