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nousness of the Fish, we readmitted it, and upon its rushing in, perceived the Light to be as it were revived and encreased; those parts of the Fish that were scarce visible before, or shone but dimly, receiving presently their former splendour.
And not to leave unprosecuted the remaining part of the Experiment, which was to try, Whether it was the Kind of the Luminous Body, or only the greatness of the Bulk, and the vividness of Light, and, if I may so speak, the Tenacity of the substance it resided in; that made the difference between the Fish and the Wood; we put part of the Fish of another kind, that shone much more faintly than that hitherto spoken of, and but in some places; and by the withdrawing the Air, we made some of the luminous parts disappear, and the others so dim, as scarce to be discerned, and yet both the one and the other regained their former light upon the return of the Air.
And to pursue the Experiment a little further, we put in such a piece of the first Fish as though it were bright, was yet but thin, and not considerably great, and upon pumping out the Air, we found it, according to our expectation, quite eclipsed, though it recovered its Light upon the Air's re-entry.
These, Sir, are the Experiments I have lately made about Shining Bodies in our Engine. More I would have tried, notwithstanding the trouble we found in managing the Engine in the dark, if rotten Wood had not failed us, and if I were not in a place, where Glass-men's Shops are not near so well furnish'd as the Stationers.
making
