160 PHOSPHORESCENCE. L.ECT. VIII. 



ments which were there during four days, emitted, after 

 that time, no more light, even when warmed. 



Here are the numbers deduced from some experi- 

 ments: 



Cubic Centim. Cubic Centim. 

 Volume of oxygen gas, in which the entire 



glow-worms were placed . . -.''*" 6'8 



Volume of gas at the end of thirty hours . ."4;,.. i . 6 2 

 Carbonic acid, absorbable by potash 4-2 

 Oxygen gas, not absorbable by potash 2'0 



62 



Loss [ascribed to the absorption of carbonic 

 acid by water on the bodies of the insects] ., _ --,,43 0-6 



The residual gas was oxygen, which disappeared by a 

 small piece of phosphorus, leaving only a very small bub- 

 ble of air. 



Other glow-worms were placed in 11-8 cubic centim. 

 of atmospheric air. After thirty-six hours, the volume of 

 air was unchanged, but it contained 2-4 cubic centim. of 

 carbonic acid. 



The phosphorescent segments of some glow-worms were 

 put into 6 cubic centim. of oxygen ; in twenty-four hours 

 we analyzed the gas, whose volume was reduced to 5-8 

 cubic centim., and we found that it contained 2 cubic 

 centim. of carbonic aid, the remainder being oxygen. In 

 all these experiments I invariably operated upon eight or 

 ten segments taken from eight or ten different glow-worms. 



Effects of Oxy-hydrogen Gas. I also observed that in a 

 mixture of 9 parts of hydrogen, and 1 oxygen, these in- 

 sects continued to live and shine, even after twelve hours 

 experimenting. I found that about half of the oxygen was 

 replaced by an equal volume of carbonic acid. 



