PLEUROTUS OSTREATUS 



487 



through the fruit-body made on December 30 is shown in Fig. 200 

 at A. 



The data for the wliole series of observations are embodied in 

 the accompanying Table. In the fourth cokimn, for the first four 

 temperatures I am indebted to the records of the Midland Institute 

 Observatory, made at Edgbaston, Birmingham. The remaining 

 temperatures were all taken with my own thermometer set close to 

 the fungus. In the fifth column the terms very cold (34°-35 -5° F.), 

 cold (36°-40° F.), mild (41°-45° F.) and warm (46°-50° F.) are, of 

 course, merely relative. 



Observations on the Production of Spore-clouds by a large Pleurotus 

 ostreatus Fruit-body growing under Natural Conditions. 



