This portrait was purchased in 1871 with the Peel collection and is said to represent the Hon. Mrs. Musters and her son. The composition does not show Sir Joshua at his best, and the painting is perhaps rather thin. The identity is not very clearly established, although the names of Mr. and Mrs. Musters are to be found in Sir Joshua's account books.] In the following year, 1784, Sir Joshua sent sixteen pictures to the Academy, including the famous Mrs. Siddons, Charles James Fox, and Mrs. Abingdon as Roxalana. Gainsborough had quarrelled with the R.A. and exhibited no more, though he lived until 1788. With December, Dr. Johnson's strenuous and useful life came to an end; he passed away exhorting his old friend never to paint on Sunday, and to read the Bible. Reynolds has left a very interesting study of the Doctor's character. In the following year, the President went for the third time to the Low Countries, and bought a number of pictures; he also received the honour of a commission from Catherine, Empress of Russia, and painted the beautiful picture of the Duchess of Devonshire and her baby that hangs at Chatsworth to-day. Walpole said, "it is little like, and not good," but posterity has declined to accept the verdict. Sir Walter Armstrong considers that it ranks with the "Lady Crosbie" and "Nelly O'Brien" as the "most entirely successful creations" of the artist. In '87 the President sent thirteen pictures to the Academy, including the "Angel's Heads" now in the National Gallery. They are studies of Frances Isabella Gordon, daughter of Lord William Gordon, and the picture was given to the Gallery in 1841. A year later, London saw the picture that the Empress Catherine had commissioned, the subject is "The Infant Hercules" and the canvas hangs in the Hermitage Gallery at St. Petersburg. It is one of the artist's failures, and he received fifteen hundred guineas for it. This is the date of the famous Marlborough family group that is to be seen at Blenheim.