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RESEARCHES ON FUNGI 



in the open, took the dish into the dark-room the temperature of 

 which was 22° C, and exposed the fungi to the warm air. For 

 3 minutes after exposure the fruit-bodies emitted no light whatever, 

 but at the end of this time they began to glow feebly and, within 

 15 minutes after first being exposed, they were glowing with their 

 maximum brilliancy. 



A Low Temperature Experiment with Panus stypt. luminescens. 



The experiment just recorded proves that the minimum tempera- 

 ture for luminescence in Panus stypt. luminescens is above — 5° C. 

 It also shows that the fruit-bodies only slowly lose their lumines- 

 cence even at a temperature below — 3 • 5° C. and that, after exposure 

 to a temperature of — 5°C., they soon recover their full power 

 of emitting light when they are brought into a warm room. 



— 1-75° to —2-7° C. A similar experiment to that just 

 described was begun at 6.30 p.m. on December 10, 1921. Observa- 

 tions were made at intervals for 7 hours, and a final observation 

 after the temperature of the air had sunk to — 10° C. at the end of 

 16 hours. The data for time, temperature, and luminescence are 

 embodied in the following Table. 



A Low Temperature Experiment with Panus stypt. luminescens. 



