Synthesized answer
The provided passages describe Nikola Tesla's lecture "On Light and Other High Frequency Phenomena" [1]. The lecture was delivered in Philadelphia in February 1893 and in St. Louis in March 1893 [1].
The passages do not provide specific details about the evidence the author presents in the lecture. They only state the title of the work and the venues and dates of its delivery [1]. Therefore, it is not possible to answer what evidence the author provides based solely on this information.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: ON LIGHT AND OTHER HIGH FREQUENCY PHENOMENA by Nikola Tesla Description: A lecture delivered before the Franklin Institute, Philadelphia, February 1893, and before the National Electric Light Association, St. Louis, March 1893.