Diderot never neglected his friends; amidst his pecuniary embarrassments, when he was reduced to coin his brain for a livelihood, his labor and his marvellous facility were always at the service of all. It was to satisfy the requirements of a dangerous fair friend that he wrote his _Pensees philosophiques,) the sad tale of the _Bijoux indiscrets_ and the _Lettre sur les Aveugles,_ those early attacks upon religious faith which sent him to pass a few months in prison at the Castle of Vincennes. It was to oblige Grimm that he for the first time gave his mind to painting, and wrote his _Salons,_ intended to amuse and instruct the foreign princes. “A pleasure which is only for myself affects me but slightly and lasts but a short time,” he used to say; “it is for self and friends that I read, reflect, write, meditate, hear, look, feel. In their absence, my devotion towards them refers everything to them. I am always thinking of their happiness. Does a beautiful line strike me, they shall know it. Have I stumbled upon a beautiful trait, I make up my mind to communicate it to them. Have I before my eyes some enchanting scene; unconsciously, I meditate an account of it for them. To them I have dedicated the use of all my senses and of all my faculties, and that perhaps is the reason why everything is exaggerated, everything is embellished a little in my imagination and in my talk; and they sometimes reproach me with this, the ingrates!” It was, further, in conjunction with his friends and in community of ideas that Diderot undertook the immense labor of the _Encyclopaedia_. Having, in the first instance, received a commission from a publisher to translate the English collection of [Ephraim] Chambers, Diderot was impressed with a desire to unite in one and the same collection all the efforts and all the talents of his epoch, so as to render joint homage to the rapid progress of science. Won over by his enthusiasm, D’Alembert consented to share the task; and he wrote the beautiful exposition in the introduction. Voltaire sent his articles from Delices. The Jesuits had proposed to take upon themselves a certain number of questions, but their co-operation was declined: it was a monument to philosophy that the Encyclopaedists aspired to raise; the clergy were in commotion at seeing the hostile army, till then uncertain and unbanded, rally organized and disciplined around this vast enterprise. An early veto, soon, however, taken off, compelled the philosophers to a certain moderation; Voltaire ceased writing for the _Encyclopaedia;_ it was not sufficiently free-going for him. “You admit articles worthy of the Trevoux journal,” he said to D’Alembert. New severities on the part of the Parliament and the grand council dealt a blow to the philosophers before long: the editors’ privilege was revoked. Orders were given to seize Diderot’s papers. Lamoignon de Malesherbes, who was at that time director of the