Farther observations on the effects which take place from the destruction of the membrana tympani of the ear; with an account of an operation for the removal of a particular species of deafness.

Sir Astley Cooper reported three cases of Eustachian obstruction deafness relieved by perforation of the membrana tympani (myringotomy), an operation first performed by Eli, a quack, in 1760. Cooper’s earlier paper on the subject appeared in vol. 90 of the Phil. Trans. He also demonstrated air and bone conduction by watch (precursor of Rinne’s test). For this work he received the Copley Medal.