Voltaire, Diderot, Holbach, would have written in a very different spirit, even while maintaining and publishing the same attacks on theological opinion, if the Church of France had possessed such a school of teachers as the Church of England found in the Latitudinarians in the seventeenth century; or such as she finds now in the nineteenth century in those who have imported, partly from the poetry of Wordsworth, partly from the historic references of the Oxford Tracts, an equity, a breadth, an elevation, a pensive grace, that effectually forbid the use of those more brutal weapons of controversy which were the only weapons possible in France a century ago.
We have already said so much of the great and important group of articles on arts and trades, that it is unnecessary to add anything further as to Diderot's particular share in them.

He visited all the workshops in Paris; he sent for information and specifications to the most important seats of manufacture in the kingdom; he sometimes summoned workmen from the provinces to describe to him the paper works of Montargis, and the silk works and velvet works of Lyons.[180] Much of Diderot's work, even on great practical subjects, was, no doubt, the reproduction of mere book-knowledge acquired at second-hand.

Take, for instance, Agriculture, which was undoubtedly the most important of all subjects for France at that date, as indeed at every other date.

There are a dozen pages of practical precepts, for which Diderot was probably indebted to one of the farmers at Grandval.

After this, he fills up the article with about twenty pages in which he gives an account of the new system of husbandry, which our English Jethro Tull described to an unbelieving public between 1731 and 1751.