HEAT PRODUCED BT LEAVES 



287 



TABLE 6-b (Autumn) 



Pirus communis 



These were fully grown leaves, picked Oct. 4 1911. Readings were taken for 

 five days. 



The leaves were not taken out of the Dewar flask until October 20. Then 

 they were brownish and dead, had a slight odor of fermentation, but showed no 

 evidences of bacterial work, and no fungi. The leaves in the carboy were slightly 

 damp, brownish, some decidedly brown, and had a decided odor of fermentation. 

 There was no bacterial or fungal growth. 



For Pirus communis Molisch reports a rise to 59° in sixteen hours, the room- 

 temperature hanging from 14° to 18°. The "second maximum" was 48.2°, after 

 five days. At the end of fourteen days the leaves were removed, and found to 

 be brown, dead, and overgrown with microorganisms, chiefly fungi. 



