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In January 1749 Bach's daughter Elisabeth Juliane Friederica married his pupil Johann Christoph Altnickol. Bach's health was however declining. On 2 June, Heinrich von Brühl wrote to one of the Leipzig burgomasters to request that his music director, Johann Gottlob Harrer, fill the and posts "upon the eventual ... decease of Mr. Bach". Becoming blind, Bach underwent eye surgery, in March 1750, and again in April, from the British eye surgeon John Taylor. Bach died on 28 July 1750, from complications connected to the unsuccessful treatment. An inventory drawn up a few months after Bach's death, shows that his estate included five harpsichords, two lute-harpsichords, three violins, three violas, two cellos, a viola da gamba, a lute and a spinet, along with 52 "sacred books", including works by Martin Luther and Josephus. The composer's son Carl Philipp Emanuel saw to it that "The Art of Fugue", although still unfinished, was published in 1751. Together with one of the composer's former students, Johann Friedrich Agricola, this son of Bach also wrote the obituary ("Nekrolog") which was published in Mizler's , the organ of the Society of Musical Sciences, in 1754.
28 July 1750