BIOLUMINESCENCE IN FUNGI 375 



(2) Between 5 a.m. and 5.30 a.m. I took a walk in the open. 

 During this period of half an hour, daylight was breaking and my 

 eyes were subjected to diffused white light. At 5.31 a.m., I re- 

 entered the dark-room and found that before the fungus lamps 

 could be perceived one minute elapsed. 



(3) Between 5.45 a.m. and 6.30 a.m. I again took a walk in the 

 open. By this time, the sun was up and from a clear and cloudless 

 sky was shining brilliantly. After having thus been exposed to 

 bright sunlight for 45 minutes, I re-entered the dark-room, with 

 the result that before the fungus lamps could be perceived 9 minutes 

 elapsed. 



(4) At noon, between 11.45 and 12.44, I took another walk in 

 the open, thus exposing myself to bright sunlight for an hour. At 

 the end of this time I re-entered the dark-room and observed that 

 before my eyes could appreciate the presence of the fungus lamps 

 11-5 minutes elapsed. 



(5) In the afternoon, between 3.35 and 4.15 p.m., I took a walk 

 in a direction in which my face was toward the declining sun. At 

 the end of this time I re-entered the dark-room and observed 

 that before the presence of the fungus lamps could be observed 

 10-6 minutes elapsed. 



(6) In the evening, between 5.40 and 6.8 p.m., I read a book by 

 the light coming in from a western window. At the end of this 

 time I re-entered the dark-room and observed that before the 

 fungus lamps could be perceived 6 • 5 minutes elapsed. 



(7) Later in the evening, after dining, I walked to the University 

 in the dark, my eyes thus becoming well rested. Upon arrival at 

 8.30 P.M., I went into the dark-room and at once I saw all thefu7igus 

 lamps glowing with their full intensity, just as at 4.50 a.m. in the 

 morning. 



When going into the dark-room at the close of the fifth experi- 

 ment, I was joined by my colleague, Mr. C. W. Lowe. He had 

 been sitting in a room with the blinds down, whereas I had been 

 exposed to bright sunlight. As soon as the door of the dark-room 

 was closed, he at once perceived the light from the fungus lamps, 

 whereas I could see nothing until 10-6 minutes had elapsed. On 

 other occasions when Mr. Lowe's eyes had been exposed to bright 



