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RESEARCHES ON FUNGI 



This was accomplished by puHing out the stopper h from the end 

 of the tube. Immediately the stopper was pulled out of the tube, 

 the fruit-bodies began to emit light and, at the end of only 



Fig. 172. — A, Apparatus for demonstrating that the luminescence of Panus stypticus 

 physiological form lumiiiescens is dependent upon the presence of oxygen : 

 a, a Kipp apparatus for generating hydrogen ; c, a wash-bottle containing water ; 

 e, the experimental tube containing two Panus fruit-bodies at g, held by the 

 stand / ; b, d, and i, stop-cocks for controlling the passage of the hydrogen 

 through the apparatus ; h, a rubber cork that can be readily pulled out of the 

 end of the tube e. B, a detail of the experimental tube, actual size. By driving 

 out the air in the experimental tube e with hydrogen, the light given out by the 

 fruit-bodies is extinguished within three seconds. If the stop-cocks d and i are 

 closed and the tube e is full of hydrogen, and if then the cork h be pulled out 

 so that air rushes into the tube' e, the fruit-bodies begin to give light again 

 within one second. 



about one second, they were emitting light with their maximum 

 intensity. 



The experiment just recorded, with slight variations in the 

 length of time the fruit-bodies were allowed to remain in the hydro- 

 gen, was repeated again and again ; and it was always found that 

 the light of the fruit-bodies completely disappeared within three 

 seconds of turning on the stream of hydrogen and reappeared within 

 one second of pulling out the stopper h and allowing oxygen to 



