on the Light emitted from various Bodies. 411 
more light was emitted, though it was kept in the gas for the 
space of four days. 
Exper. 11. A cork, made very luminous with herring-light, 
was put above water, into this gas, at 20 minutes past 8 P. M. 
and it continued very lucid at eleven. The next evening, at ten 
o’clock, the light was nearly extinguished. 
A similar experiment was made, at the same time, in common 
atmospherical air, and with the same result. 
Exper. 12. Another cork was introduced above water, with 
herring-light, at 40 minutes past 7 P. M. and it remained pretty 
luminous at eleven. On the following night, it was nearly 
extinct. 
Hi. The last mentioned azotic Gas, after being washed with 
Lime Water. 
Exper. 13. A piece of herring, of about three drams weight, 
was put above water, into this azotic gas, at 5 P. M. On the 
second night, it was dark ; on the third, very lucid ; and on the 
fourth, the same. 
Exper. 14. The experiment was repeated, on a piece of her- 
ring, at 3 P. M. On the second evening, it was dark ; on the 
third, pretty luminous ; on the fourth, it was less so ; and on 
the fifth, only a faint light remained. 
Exper. 15. A portion of fresh mackerel was then put above 
water, at 1 1 A. M. On the second night, it was observed to be 
moderately shining ; on the third, the light was extinct. 
Exper. 1 6. Another piece of fresh mackerel was introduced 
above water, at 3 P. M. On the second evening, it was slightly 
luminous ; on the third, it was dark, and continued so during 
the four succeeding nights. 
3 G 2 
