Letters of Euler on Different Subjects in Natural Philosophy - Addressed to a German Princess; With Notes, and Life of Euler Vol 1 of 2 by Leonard Fuler 
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Excerpt from Letters of Euler on Different Subjects in Natural Philosophy, Vol. 1 of 2: Addressed to a German Princess; With Notes, and a Life of Euler
Independently of the great popularity of this work, it possesses a particular interest at the present time, in consequence of its containing a popular view of the doctrine, that light consists in the undulations Of an ethereal medium, which is now generally adopted, in consequence of recent discoveries in optics.