Herschel recounts a story about Voltaire and makes arrangements to visit De Morgan.

He quotes from Sir Isaac Newton (‘Tho’ often he forgot to Eat / Never forgot to drink Sir!’), noting that this: ‘is a noble illustration but it puts me in mind of Voltaire’s rather unscrupulous procedure in re Habakkuk. On the chance of your not knowing it (rather a slender one since you seem to be use to, if not the actual author of all the fun that is going on in the world) I will tell it. He, the said Voltaire, was dictating a “moral” essay (after his fashion) to his secretary & was going on at a great rate quoting Habakkuk[…] The poor secretary wrote all down but with increasing dismay & misgiving till at length his heart kindled & he spoke with his tongue “Mais, Monsieur, Habakkuk ne dit nul part rien de parcil!!” Voltaire was down upon him at once with “Taissez vous, insolent! S’il ne le dit pas il l’a pu dire. Habakkuk est capable de tout!” Isn’t that sublime?’

The lines are part of the third Discours and represent ll.99-102.

Marx opens by saying that he has enclosed a photograph for Mrs Beesly. He then goes on to say that the Christian name of Mr. Greenwood is Frederick, adding in French that this is not the Frederick the Great. He continues by remarking that when Voltaire was in his Swiss retreat, he was accompanied by a Jesuit named Adam whom he introduced by visitors by saying: ‘he is not the first of men’. Returning to writing in English, Marx concludes the letter by saying that Jenny von Westphalen will call on Mrs Beesly the following Wednesday at 1pm.

Frederick begins by describing himself as ‘The Damned Philosopher’ who is compelled to send Voltaire his thoughts, despite them being nonsense. He asks Voltaire not to accuse him if indiscretion, but rather to put his letter into the category of Bluebeard and the thousand and one (Perrault’s famous fairytale) if it bores him. He then enters a philosophical discussion in the form of an allegory in which the leading writers of the Enlightenment, led by Voltaire, fight against the “infamous”. Frederick writes that he does not believe that Mustafa III, sultan of the Ottoman Empire from 1757 to 1774, or many others are concerned about this, with only those aware of the Greek saying: ‘Know thyself’ wanting to what they are, and who they are, and indeed what they must forget about themselves in order to advance knowledge. Frederick ends the letter by noting that the Grand Cordelier of Saint-Pierre knows what to expect but has been paid not to reveal the secrets of the Church, adding that he reckons the Grand Cordelier will be more concerned about Avignon than Jerusalem. In a humorous tone, he concludes that he wants to be discreet and not steal a moment from a man whose moments are so well spent that Frederick wishes that he may last as long as his statue.