3(J OBSERVATIONS ON SPONTANEOUS LIGHT. 



A firailar experiment was made, at the fame time, in atmo- 

 fpherical air. At 1 1 P. M. the cork was but moderately lumi- 

 nous; and on the next evening it was dark. 



Exp. 4. At 40 minutes paft7 P. M. another cork, rendered 

 very luminous with herring-light, was introduced above water. 

 This cork, at 11 P. M. was not found fo lucid as that in the 

 third experiment. On the next evening, a glimmer of light 

 was Hill perceptible. 



Exp. 5. A fragment of very (liining wood was introduced 

 above water, into this gas ; and it was rendered dark in about 

 15 minutes. 



Exp. 6. The experiment was repeated ; and the light was 

 again extinguifhed in about 15 minutes. In another experi- 

 ment it was extinguifhed in about 25 minutes. 



II. Atmqfpheric Air rendered azotic, by burning Spirit of Wine 



in it, when confined above Water 



Atmofpheric Exp. 7. A portion of frefh herring, of about three drams, 



azote. was p U t above water, into this azotic gas, at 5 P. M. On the 



fecond evening, a fpark of light was obfervable ; on the third, 



the quantity of light was increafed j on the fourth, it was again 



diminifhed. 



Exp. 8. At 3 P. M. the ufual quantity of herring was in- 

 troduced above water. On the fecond night, it remained 

 dark ; on the third it was moderately luminous ; on the fourth, 

 it was lefs fo ; on the fifth, the light was extinct. 



Exp. 9. A piece of frefh mackerel was next put above 

 water, at 1 1 A. M. On the fecond evening, it was found to 

 be flightly luminous ; it remained fo on the third j on the fourth, 

 it was dark. 



Exp. 10. Another piece of frefh mackerel was introduced 

 above water, at 3 P. M. On the fecond night, it was found 

 to be flightly luminous ; but on the third, it was dark ; and no 

 more light was emitted, though it was kept in the gas for the 

 fpace of four days. 



Exp. 1 1 . A cork, made very luminous with herring-light, 

 was put above water, into this gas, at 20 minutes paft 8 P. M. 

 and it continued very lucid at eleven. The next evening, at 

 ten o'clock, the light was nearly extinguifhed. 



A fimilar experiment was made, at the fame time, in com- 

 mon atmofpherical air, and with the fame remit. 



Exp, 



