They are stated, as nearly as possible, in the words in which I have heard them in public debate, or in private conversation with gentlemen of Infidel principles.

I have made no references to books or writers on that side, save to such as I am assured were the sources of their sentiments.

In such cases I have named and quoted the authors.

Where no such quotations are noticed it will be understood that I am responsible for the fairness with which I have represented the opinions which are examined.

It is not my design to fight men of straw.
Every historical or scientific fact adduced in support of the arguments here used is confirmed by reference to the proper authority.