Mary, the youngest, seems to have been a spinster of no striking qualities. We know little of her, except that she was born in 1725 and died in 1782.[41] There exists one letter from William to her of the year 1753, and he mentions her in a letter, dated April 9, 1755, as living with him. And indeed he was always kind to her, as she seems to have habitually resided with him. Mrs. Montagu writes in July 1754: 'Miss Mary Pitt, youngest sister of Mr. Pitt, is come to stay a few days with me. She is a very sensible, modest, pretty sort of young woman, and as Mr. Pitt seem'd to take every civility shown to her as a favour, I thought this mark of respect to her one manner of returning my obligations to him.'[42] But even she, though colourless, seems not to have been wholly devoid of the Pitt temperament, though she seems to have always been on intimate terms with her family. 'She had,' says Lord Camelford, 'neither the beauty of two of her sisters, nor the wit and talents of her sister Ann, nor the diabolical dispositions of her sister Betty. She meant always, I believe, to do right to the best of her judgement, but that judgement was liable to be warped by prejudice, and by a peculiar twist in her understanding which made it very dangerous to have transactions with her.' The 'peculiar twist,' which even Mary could not escape, was innate in most Pitts. We have kept Ann to the last, though she was third of the sisterhood in point of age, being born in 1712, and so four years younger than William, whose peculiar pet and crony she was for the earlier part of their lives. She was in her way almost as notable as he, and she resembled him in genius and temper, as Horace Walpole wittily observed, '_comme deux gouttes de feu_.' But drops of fire, did they exist, would probably not amalgamate for long, and one would guess that Ann and William were too much alike to remain in permanent harmony. Perhaps, too, their extreme intimacy made them too well acquainted with each other's tender points, a dangerous knowledge when coupled with great powers of sarcasm. One might surmise, too, that Pitt's wife, always apparently cold to Ann, might be disinclined to encourage the renewal of an intimacy which might once more attract William's closest confidence, though we have a letter[43] from Ann, dated 1757, in which she speaks with nothing less than rapture of Lady Hester's kindness to her. Lady Hester's immaculate caligraphy and frigid style give in our easier days an impression of distance and austerity.