STUDIES ON THE LUMINOUS FUNGUS. 13 



Strong agitation of the water at that period caused a slight revival 

 of the light. Also the diminished light could be brought to tem- 

 porary revival by removing the specimen into new water of the 

 same temperature. Two minutes after revival, the light again 

 became feeble ; and after three hours from the beginning, it be- 

 came quite invisible. Five minutes after that, the specimen was 

 taken out into the air, in which it began to emit light after two 

 minutes and eventually recovered the original degree of luminosity. 

 A small specimen weighing 115 grammes was put into water of 

 the same temperature as above. Its light commenced to fade after 

 ten minutes. Taken out into the air immediately after complete 

 loss of light, it took thirty seconds to begin to glow again and 

 one minute to recover completely. Another specimen, which has 

 been kept long in the water and has completely lost luminosity, 

 took two minutes to recover its original light intensity. 



(c) 30°C. When a specimen was put into water of 30°C, the 

 light began to fade away after twenty seconds and became in- 

 visible after five minutes. When the water was stirred, the light 

 revived, and, when restored to the air, immediately recovered the 

 original intensity. The specimen was again placed in the water, 

 and when it was restored to the air after ten minutes, it began 

 to emit light after one second and completely recovered the lumi- 

 nosity after five seconds. 



(d) 35 C C. In the water of 35°C. the light began to fade in 

 ten seconds, and became invisible after three minutes. On being 

 taken out into the air, it immediately began to emit light. Iii 

 ten seconds more, complete recovery of luminosity ensued. 



(e) 40°C. Five seconds after a specimen was placed in the 

 water of 40°C, the light began to fade slowly and finally became 

 invisible in one minute. The object was kept twelve minutes in 

 the water and was then restored to the air. In half an hour, the 



