Synthesized answer
The provided passages do not contain information about the evidence the author provides. The passage is titled "Procedures and Metaphysics by Edward William Strong" and categorizes the work as "Mathematics." This title and categorization do not offer any details regarding the evidence presented in the book. Therefore, I cannot answer your question based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Procedures and Metaphysics by Edward William Strong Categories: Mathematics