The Analogy of Sound and Light. was lately given by Professor Barrett of the Royal College of Science Dublin on ' Some Experiments Illustrating the Analogy of Light and Sound.' The Professor commenced by referring to some of the well about eight minutes to travel to Birmingham a little over one hundred miles while in the same time the light from the flash would have traveled to the sun a distance of over ninety millions of miles. But though they so differ in the rate of progress both light and sound show many phenomena in common. flame was used as a detector of sound. This delicate acoustic Tyndall's lectures was first we believe discovered in 1866 by Professor Barrett though he modestly did not allude to the fact. Indeed most of the experiments shown during the the Royal Dublin Society in January 1868 and the dis The performance of the experiments however was entirely new to a London audience. The analysis of the phenomena of light and sound were illustrated in the following order: 1. Both light and sound of sound this was shown with a loud ticking watch and a the same as the angle of reflection. In the case of sound reflector placed at the end where they approached. The dis convex lenses were used; and in the case of sound analogous but less familiar lenses of gas of a different density from air the sensitive flame. '1 Both light and sound suffer absorp tion in passing through non-homogeneous media. Professor Tyndall's apparatus showing the ' echoing back ' of sound familiar with the fact that though light may traverse a vessel of clear water it can no longer travel when it is filled with bubbles of transparent air. 5. There is an analogy between the sympathy among the same notes of a gamut and the sympathy among individual colors in the spectrum. An in candescent body that produces a particular bright band in absorb light and cause a dark band in exactly the same part are responsive to vibrations produced by others exactly in in a very clear manner. 6. An analogy
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