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Sir, It is now some Months ago that I promised to give theSociety an Account of what Experiments I had then made; but soon after there occurr'd to my Thoughts several others, which I was willing to try the Success of; which Experiments requiring an Addition to theApparatus , that I might make them more compleat, I hope will be a sufficient Apology for this Delay.

philosophical transactions of the royal society of london

V Experiments and observations upon the light that is produced by communicating electrical attraction to animal or inanimate bodies, together with some of its most surprising effects; communicated in a letter from Mr. Stephen Gray, F. R. S. to Cromwell Mortimer, M. D. R. S. Secr