Experiments and observations on the light which is spontaneously emitted, with some degree of permanency, from various bodies. / By Nathaniel Hulme, M.D. F.R.S. and A.S. From the Philosophical Transactions.

Nathaniel Hulme

Date:: 1800

Credit: Experiments and observations on the light which is spontaneously emitted, with some degree of permanency, from various bodies. / By Nathaniel Hulme, M.D. F.R.S. and A.S. From the Philosophical Transactions. Source: Wellcome Collection.

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$tinued to decrease; and on the seventh it was quite gone. Nei¬ ther the liquid, nor the herring, had contracted any putrid smell. Exper. 4. With sea water two ounces. On the second night, dark; on the third, fourth, and fifth, luminous; on the sixth, nearly extinct; and on the seventh, totally. The piece of her¬ ring, when taken out and examined, was remarkably sweet. • \ Roe of Herring* Exper. 5. With Epsom salt two drams, and water two ounces. On the second night, the liquid was pretty luminous ; on the third and fourth, still luminous; and on the fifth its light was extinct. Exper. 6. With Glauber's salt or vitriolated natron two drams, to two ounces of water. On the second night, when the phial was shaken, as usual in all these experiments, the liquid was pretty luminous; on the third, less so; and on the fourth the light was scarcely visible. Exper. 7. With sea water two ounces. On the second night, dark; on the third, the liquid was moderately luminous; on the fourth and fifth, it had extracted much light; and on the seventh it was still shining. After this process, both the roe and the sea water remained perfectly sweet. The Flesh of Mackerel. Exper. 8. With Epsom salt two * drams, and water two ounces. On the-’Second night, the liquid was finely illuminated, on the third, a similar appearance; on the fourth, a diminution of light; on the fifth, it continued lucid in a small degree; and on the sixth the light was extinguished.$