Negative Research

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=X3oZAAAAYAAJ&newbks=1&newbks_redir=0&dq=an%20outline%20of%20logic&pg=PP5&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=ImTmkBZhRBIC&newbks=1&newbks_redir=0&dq=negative%20propositions&pg=PA1&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=ImTmkBZhRBIC&newbks=1&newbks_redir=0&dq=negative%20propositions&pg=PA8&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=ImTmkBZhRBIC&newbks=1&newbks_redir=0&dq=negative%20propositions&pg=PA8&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=jSUCAAAAQAAJ&newbks=1&newbks_redir=0&dq=negative%20propositions&pg=PA1&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=qztDAQAAMAAJ&newbks=1&newbks_redir=0&dq=negative%20propositions&pg=PA188&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=qztDAQAAMAAJ&newbks=1&newbks_redir=0&dq=negative%20propositions&pg=PA188&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=9coAAAAAMAAJ&newbks=1&newbks_redir=0&dq=sir%20william%20hamilton&pg=PA39&output=embed" width=500 height=500></iframe>

<iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.com/books?id=Y1tEAAAAcAAJ&newbks=1&newbks_redir=0&dq=stoicheiology&pg=PA65&output=embed" width=500 height=500></iframe>