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Figure 165. Amounts of total sugar found in peanut and bean leaves at intervals 

 during the night. Comparison of residual dry weight and total nitrogen as bases for 

 calculating the change in total sugars. 



deciduous leaves during a period of 41 days previous to autumn leaf fall. 

 His methods, results, and conclusions are stated by him as follows: p-^" 

 "Samples of 50 pairs of opposite leaves of Viburnum dentatum and Syringa 

 vulgaris were selected to measure the changes in leaves at intervals of three 

 to five days from September 24 to November 4, at which time the experi- 

 ment was ended because of frost. One leaf of each pair was taken at the 

 beginning and the other was left on the plant until the end of each interval, 

 there being ten such intervals during the experimental period. 



"Dry weight, sugars, polysaccharides (alcohol-insoluble substances 

 hydrolyzable \\'ith dilute acid), and nitrogen were determined, and calcu- 

 lations were made upon three bases: per cent of the dry weight, per cent of 

 the residual dry weight (obtained by subtracting from the dry weight the 

 sum of the carbohydrates and 6.25 times the nitrogen), and the total 

 amounts of constituents in 50 leaves. 



"The dry weight of the leaves was nearly constant throughout the period 



