HEAT PRODUCED BY LEAVES 



285 



TABLE 5 



Tilia Americana 



Leaves young, picked May 6 1911. Experiment ended May 10, 1911. Where 

 there is a considerable lapse between readings, the temperatures remained con- 

 stant. 



When the leaves were removed, on May 9, various changes were noticed. In 

 the carboy, many leaves were brown and damp, others fresh and green. Also 

 there was considerable odor of decay. In the 2-liter flask, there was no evidence 

 of decay, though the leaves were somewhat brownish. In the Dewar flask, the 

 leaves were quite brown, and withered. There was a very noticeable odor, and 

 considerable soft bacterial decay. 



For Tilia sp., Molisch records a maximum of 50.8°, the room temperature being 

 on the average 18°, in 27.5 hours. The "second maximum" was 52.1°; length of 

 time not given. 



