Subsamples were taken, ground to 40 mesh, and used for analysis. Ash content, 

 diethyl ether extractives, and high heat content were determined using standard 

 procedures.^ Three replications of DTA and TGA were performed on a DuPont Model 900 

 thermal analyzer. The N2 was 99.98-percent pure by volume. The TGA was run on 10-mg. 

 samples in air or N2 at 100 cc./min. with a heating rate of 15° C./min. The DTA was 

 run on approximately 5-mg. samples in an N2 atmosphere, with flushing at 1 liter/min. 

 and heating at 15° C./min., using Si02 for reference. 



A 60-g. sample (dry weight) of the whole leaves was burned in 0.5-sq.ft. circular 

 fuel beds under controlled conditions. The combustion facilities have been described 

 previously (1). The dry-bulb temperature \\?as 85° F. and the relative humidity 22 

 percent. The bed was burned by igniting 1 ml. of acetone placed in the center of the 

 fuel. Weight loss was recorded over time with a small weighing platform connected to 

 a 10- lb . -capacity Statham load cell. The output was fed through a voltage divider and 

 into a Bausch and Lomb millivolt recorder (fig. 1). 



3 American Society for Testing Materials. D1108-56- -Ether solubility of wood; D 11 02 -56- -Method 

 of test for ash in wood; D2015-66- -Method of test for gross calorific value of solid fuel by the adiabatic 

 bomb calorimeter. ASTM Standards. 



2 



