100 OBSERVATIONS ON SPONTANEOUS LIGHT. 



IX. 



A Continuation of the Experiments and Obfervations on the Light 

 which is fpontaneoujly emitted from various Bodies ; with fame 

 Experiments and Obfervations on folar Light, when imbibed 

 by Canton's Phofphorus. By Nathaniel Hulme, 

 M.D.F. R.S. andA.S. 



(Concluded from page 40 .) 



§ 5. 



The Efftcls of carbonic Acid Gas or fixed Air * on fpontaneous 

 light. 



EXPERIMENTS. 



Carbonic acid £™ i.At 10 P.M. a piece of frefh herring, weighing 

 gas extinguifhes t f- ■ _ Y . ., , , ° 



Spontaneous about three drams, was impended in a wide-mouthed ten- 

 light; but it re- ounce phial, filled with carbonic acid gas, and clofed with a 

 mon air. ° ' cor ^ all( * bladder. It was retained there for three fucceffive 

 nights ; but emitted no light. 



Exp. 2. The fame experiment was made with a piece of 

 herring, which was beginning to be luminous. On the next 

 evening, the illumination was found to be extincl: : never- 

 theless the herring was ftill kept in the gas for three nights 

 longer, but did not become lucid. 



Exp. 3. At 7 P. M. a piece of frefli mackerel was intro- 

 duced above water, into a wide-mouthed bottle, holding 24 

 ounces, which was completely filled with carbonic acid gas, 

 and fupported by a tea-faucer that held about three ounces of 

 water. On the fecond night it was dark, and continued the 

 fame on the third. It was then expofed to the influence of 

 atmofpherical air, and, on the next evening, it was pretty 

 luminous, and likewife on the fucceeding night. 



Exp. 4. At 9 P. M. a cork, fmeared with the luminous 

 matter of a mackerel, was put into a five-ounce wide-mouthed 

 phial, filled with carbonic acid gas, and then clofed with a glafs 



* This gas was obtained from powdered chalk, or marble, and 

 diluted fulphuric acid, 



fiopple. 



