Diderot's Dangerous Idea

In the late 1740s, bookseller and printer, Andre Le Breton, approached Denis Diderot to undertake a French translation of Ephraim Chambers' Cyclopaedia, or Universal Dictionary of the Arts and Sciences.

Instead, Diderot decided to produce an original work that would encompass all branches of knowledge and challenge conventional ways of thinking. From the outset, the project was viewed as a threat to ecclesiastical and aristocratic power, in that it advocated religious tolerance, freedom of thought, and the value of science and industry. The first volume appeared in 1751, but in 1752 a court order was issued to cease the project. With the help of sympathetic supporters, Diderot was able to continue work in secret, and a second decree was issued in 1759 in an effort to suppress the work. Despite continual harassment and loss of friends and associates, Diderot carried on, with the final volumes of the 28 volume set finally being distributed to subscribers in 1772.
The photograph inserted above shows the title page of the first volume. This volume is part of a complete first edition set from the collection of about 400 rare books, that until recently were held at the Fortress of Louisbourg in Cape Breton, Nova Scotia. The collection has been moved to the Beaton Institute at Cape Breton University, where it will be maintained in the archive and be made available to researchers.