More than sixteen years elapse between this letter and the next, which takes us far beyond our present limit, but it is best to finish the story of Ann. Part of this long interval can be explained by extreme harmony, and the remainder by the reverse. The mutual devotion of William and Ann lasted, says Lord Camelford, till he became Paymaster in May 1746: then they quarrelled. Why, no one knows, or, it is to be presumed, will ever know. Horace Walpole only says that Pitt shook his sister off in an unbecoming manner. Camelford thinks that Pitt disliked Ann's friendship for Lady Bolingbroke, and thought that she was under the influence of Bolingbroke himself, 'that tawdry fellow, as Lord Cobham called him.'[76] Pitt, like most other people, except the rare spirits who loved the brilliant being, profoundly distrusted Bolingbroke, and may not have wished to see Bolingbroke influence assume a footing in his house. Perhaps then he remonstrated, perhaps Ann vindicated her friendship with heat. Between these two fiery natures words might be exchanged in a moment which years would not obliterate. Grattan told Rogers that 'Mrs. Ann Pitt, Lord Chatham's sister, was a very superior woman. She hated him, and they lived like cat and dog. He could only get rid of her by leaving his house and setting a bill on it, "This house to let."'[77] If these two Pitts quarrelled in the fierce Pitt fashion, it is not unlikely that some such expedient would be adopted. But it must be doubted whether they lived like cat and dog, else they would have parted long before. Grattan's statement was made in conversation with all the large outline and picturesque latitude that conversation allows, and he probably knew nothing about the matter. We can only surmise. Lord Camelford tells us that up to the time of the Paymastership (1746) William and Ann had lived together in one of the small houses in Pall Mall which look into St. James's Square, and that when he moved to his official residence at the Pay Office he moved alone. But, as a matter of fact, she had left him some time before, and gone to live with Lady Bolingbroke at Argeville. We have a letter from William to Lady Suffolk, dated July 6, 1742, in which he favours the plan of Ann's living with Lady Bolingbroke, so long as is convenient to her hostess, and then returning home. Moreover, Pitt himself in October of this year 1742 was not living in Pall Mall, but had moved to York Street, Burlington Buildings.[78] Ann had formed a mad project of living in Paris as a single woman, which William justly discountenanced. However, she proceeded to Argeville, where George Grenville found her in September. She may have returned to her brother, but she probably remained abroad, and her having been with the Bolingbrokes so long, even with William's sanction, may have made her less welcome to her brother on her return.