on the Light emitted from various Bodies. 181 



This experiment was very frequently repeated. It had the same 

 illuminating effect upon the light of a dead glow-worm. 



Exper. 9. The complete influence of 212 degrees of heat was 

 now applied to the light of a glow-worm, by pouring upon 

 one when dead, but in a luminous state, some boiling water. 

 Its light was instantly extinguished thereby, and did not revive. 

 The experiment was repeated, and with the same result. 



Any of the saline Solutions mentioned in the fourth Section, being 

 impregnated with luminous Matter, and left some Time at rest y 

 are rendered more lucid by a moderate Degree of Heat. 



Exper. 10. A quantity of illuminated solution was deposited 

 in the laboratory. The next evening, when it was examined, 

 it appeared in a manner quite dark ; but, by putting the phial 

 which contained it into hot water, the light revived, and was 

 soon rendered exceedingly vivid. 



Exper. 11. About a pint of solution impregnated with light, 

 had become obscure; by time and rest, as is the nature of this 

 mixture. Such a quantity of boiling-hot water was then added 

 to it, as only to give it a small degree of warmth, and it quickly 

 caused it to appear luminous. 



Exper. 12. Illuminated liquid, to the quantity of four ounces, 

 was placed in the laboratory until the next evening, when it 

 had become almost dark. One spoonful of boiling-hot water 

 being put into it, the light re-appeared ; and, by means of two 

 more, it was rendered considerably lucid. 



Their Light is extinguished by a great Degree of Heat. 

 Exper. 13. Some boiling water being poured upon three or 

 four ounces of illuminated liquid, in an earthen vessel, the light 

 was immediately extinguished ; and, though afterwards kept a 



