A short time after reading Prof. John Tyndall’s excellent article “On the Sounds produced by the Combustion of Gases in Tubes,”[83] I happened to be one of a party of eight persons assembled after tea for the purpose of enjoying a private musical entertainment. Three instruments were employed in the performance of several of the grand trios of Beethoven, namely, the piano, violin, and violoncello. Two “_fish-tail_” gas-burners projected from the brick wall near the piano. Both of them burned with remarkable steadiness, the windows being closed and the air of the room being very calm. Nevertheless, it was evident that _one_ of them was under a pressure nearly sufficient to make it _flare_. Soon after the music commenced, I observed that the flame of the last-mentioned burner exhibited pulsations in height which were _exactly synchronous_ with the audible beats. This phenomenon was very striking to every one in the room, and especially so when the strong notes of the violoncello came in. It was exceedingly interesting to observe how perfectly even the _trills_ of this instrument were reflected on the sheet of flame. _A deaf man might have seen the harmony_. As the evening advanced, and the diminished consumption of gas in the city _increased the pressure_, the phenomenon became more conspicuous. The _jumping_ of the flame gradually increased, became somewhat irregular, and finally it began to flare continuously, emitting the characteristic sound indicating the escape of a greater amount of gas than could be properly consumed. I then ascertained by experiment that the phenomenon _did not_ take place unless the discharge of gas was so regulated that the flame approximated to the condition of _flaring_. I likewise determined by experiment that the effects _were not_ produced by jarring or shaking the floor and walls of the room by means of repeated concussions. Hence it is obvious that the pulsations of the flame _were not_ owing to _indirect_ vibrations propagated through the medium of the walls of the room to the burning apparatus, but must have been produced by the _direct_ influence of the aërial sonorous pulses on the burning jet.