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The Lecturer gave an exposition of the substance of a Paper, communicated by him under the above title, and illustrated his Lecture by a repetition, before the Society, of the Experiments described. The following is an abstract:— The author refers to the stratified appearance of the electrical discharge when taken from the terminals of a Ruhmkorff’s inductioncoil in the vapour of phosphorus, and in highly attenuated gases, first noticed by Mr. Grove (Phil. Trans. Part I. 1852, and Phil. Mag., Dec. 1852). Having witnessed the experiments of Mr. Grove, Mr. Gassiot in the same year examined the discharge in a barometrical vacuum in which the mercury had been carefully boiled, but he could not obtain any signs of stratification. These experiments were subsequently repeated by several continental electricians, whom he names, and who all describe the induction-discharge in a barometrical vacuum as intensely white, and filling the whole tube without stratification.

The Bakerian Lecture - On the stratifications and dark bands in electrical discharges as observed in torricellian vacuums