Among the articles in English Reviews, many bear marks of careful study; and it is a pleasure to have the opportunity of rescuing them from the neglect which is likely to occur to papers written without name, and in periodicals. The freethinking Reviews have discussed the opinions of the friends of free thought more frequently than the others; but those here cited are of all shades of opinion; and the writer has found many to be of great use, even when differing widely from the conclusions drawn. He is glad indeed to take this opportunity of expressing his thanks to the unknown authors of these various productions, which have afforded him so much instruction, and often so much help. He trusts that he has in all cases candidly and fully acknowledged his obligations when he has borrowed their materials, or condensed their thoughts. If he has in any case, through inadvertence, failed to do so, he hopes that this acknowledgment will be allowed to compensate for the unintentional omission. ------------------------------------- The reader being now in possession both of the purpose designed in the lectures, and of the sources of the information used in their composition, it only remains to add a few miscellaneous remarks. In the delivery of the lectures, several portions were omitted, on account of the excessive length to which they would have run. It has not been thought necessary to indicate these passages by brackets; but, as those who heard them may perhaps wish to have an enumeration, a list is here subjoined.(63) The notes, it will be perceived, are placed, some at the foot of the text, others at the end. Those are put as foot-notes which either were very brief, or which supplied information that the reader might be supposed to desire in connection with the text. Most of those which are appended are of the same character as the foot-notes; i.e. sources of information in reference to the subjects discussed in the text. A few however supply information on collateral subjects. The Notes 4, 5, and 49, will be found to contain a history of Apologetic Literature parallel with the history of Free Thought; and Note 21 discusses the history of some technical terms commonly employed in the history of doubt. The size of the subject has precluded the possibility of giving many extracts from other works; but it may be permitted to remark, that the literary references given are designed to supply sources of real and valuable information on the various points in relation to which they are cited. It can hardly be necessary to state, that the writer must not in any way be held responsible for the sentiments expressed in the works to which he may have given references. In a subject such as that which is here treated, many of the works cited are neutral in character, and many are objectionable. But it is right to supply complete literary materials, as well as references to works which state both sides of the questions considered.