on the Light emitted from various Bodies. 167 



tinued to decrease; and on the seventh it was quite gone. Nei- 

 ther the liquid, nor the herring, had contracted any putrid smell. 

 Exper. 4. With sea water two ounces. On the second night, 

 dark ; on the third, fourth, and fifth, luminous ; on the sixth, 

 nearly extinct ; and on the seventh, totally. The piece of her- 

 ring, when taken out and examined, was remarkably sweet. 



Roe of Herring* 



Exper. 5. With Epsom salt two drams, and water two 

 ounces. On the second night, the liquid was pretty luminous ; 

 on the third and fourth, still luminous ; and on the fifth its light 

 was extinct. 



Exper. 6. With Glauber's salt or vitriolated natron two 

 drams, to two ounces of water. On the second night, when the 

 phial was shaken, as usual in all these experiments, the liquid 

 was pretty luminous; on the third, less so; and on the fourth 

 the light was scarcely visible. 



Exper. 7, With sea water two ounces. On the second night, 

 dark ; on the third, the liquid was moderately luminous ; on 

 the fourth and fifth, it had extracted much light ; and on the 

 seventh it was still shining. After this process, both the roe 

 and the sea water remained perfectly sweet. 



The Flesh of Mackerel. 



Exper. 8. With Epsom salt two drams, and water two 

 ounces. On the second night, the liquid was finely illuminated; 

 on the third, a similar appearance ; on the fourth, a diminution 

 of light ; on the fifth, it continued lucid in a small degree ; and 

 on the sixth the light was extinguished. 



• The quantity used in each experiment was about four drams. 



