BELL, Alexander Graham (1847-1922). Letter signed ("Alexander Graham Bell"), to the Editor of the Journal of the Franklin Institute. Washington, D.C., 19 March 1881. 1 page, 8vo, on Volta laboratory stationery, with note "Personal" written at upper left (possibly in Bell's hand), with holograph envelope in a secretarial hand, slight ink bleed. Bell requests an account of experiments concerning the mechanical actions of light referenced in an article on page 225 of the Franklin Journal for March 1881. "Can you kindly direct me where to obtain an account of the experiments referred to. Is the American Philosophical Society the same as the Washington Phil. So.?"