Synthesized answer
The provided passages do not detail the specific evidence the author provides. The passages state that the work begins with an examination of the distinction between performative utterances and statements [Passage 1]. From this examination, Austin abandons the distinction and replaces it with a more general theory of 'illocutionary forces' of utterances [Passage 1]. However, the nature of the evidence used to support these conclusions, or the transition from the examination to the abandonment and replacement, is not described.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: How to do things with words by J. L. Austin Description: This work sets out Austin's conclusions in the field to which he directed his main efforts for at least the last ten years of his life. Starting from an exhaustive examination of his already well-known distinction between performative utterances and statements, Austin here finally abandons that distinction, replacing it with a more general theory of 'illocutionary forces' of utterances which has important bearings on a wide variety of philosophical problems.