Even at the time when Mr Hume was employed in doing Mr Rousseau the most essential service, he received from him the most insolent and abusive letter. The more such a stroke was unexpected, the more it was cruel and affecting. Mr Hume wrote an account of this extraordinary adventure to his friends at Paris, and expressed himself in his letters with all that indignation which so strange a proceeding must excite. He thought himself under no obligation to keep terms with a man, who, after having received from him the most certain and constant marks of friendship, could reproach him, without any reason, as false, treacherous, and as the most wicked of mankind. In the mean time, the dispute between these two celebrated personages did not fail to make a noise. The complaints of Mr Hume soon came to the knowledge of the public, which at first hardly believed it possible that Mr Rousseau could be guilty of that excessive ingratitude laid to his charge. Even Mr Hume's friends were fearful, lest, in the first effusions of sensibility, he was not carried too far, and had not mistaken for wilful crimes of the heart, the vagaries of the imagination, or the deceptions of the understanding. He judged it necessary, therefore to explain the affair, by writing a precise narrative of all that passed between him and Mr Rousseau, from their first connection to their rupture. This narrative he sent to his friends, some of whom advised him to print it, alleging, that as Mr Rousseau's accusations were become public, the proofs of his justification ought to be so too. Mr Hume did not give into these arguments, choosing rather to run the risk of being unjustly censured, than to resolve on making himself a public party in an affair so contrary to his disposition and character. A new incident, however, at length overcame his reluctance. Mr Rousseau had addressed a letter to a bookseller at Paris, in which he directly accuses Mr Hume of having entered into a league with his enemies to betray and defame him; and in which he boldly defies Mr Hume to print the papers he had in his hands. This letter was communicated to several persons in Paris, was translated into English, and the translation printed in the public papers in London. An accusation and defiance so very public could not be suffered to pass without reply, while any long silence on the part of Mr Hume might have been interpreted little in his favour.