"Whilst engaged also in the enquiry... we have been discussing, he checked the results obtained with , by observing the diminution which air underwent when exposed to dissolved in water, and when exploded with in a shut vessel by means of the electric spark. The apparatus last referred to is... Cavendish's Eudiometer, and... in connexion with the discovery of the composition of water, has been selected by the Cavendish Society as their emblem, and placed on the title-page of their publications."