Rupert Crawshay-Williams 
Methods and Criteria of Reasoning [EPUB ebook] 
An Inquiry into the Structure of Controversy

First published in 2000. This is Volume V of eight in the Library of Philosophy series on the Philosophy of Mind and Language. Written in 1957, this book enquires how we use language as an instrument of reason, and whether our present use of it is efficient. The use of language for communication is treated as subsidiary.