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That the length of vibration is [[?]], granting the truth of the theory, is shown by the fact that the intensity of light is increased by the introduction of the solid body.

Persuing this train of reflection, I may ask is not [[strikeout]] the kind of [[/strikeout]] light changed in its character by passing through a transparent medium, and may not the results obtained by Sir David Brewster in his analysis of the spectrum, have been produced in this way.

Connected with this subject is that of the difference observed in the chemical ray of the same colour derived from the prism, and from some colored medium.


[[vertical wording lower right corner]] Speculations on Light and heat