„I should be writing a third paper on the Nerves, but I cannot proceed without making some experiments, which are so unpleasant to make that I defer them. You may think me silly, but I cannot perfectly convince myself that I am authorised in nature, or religion, to do these cruelties—for what?—for anything else than a little egotism or self-aggrandisement; and yet, what are my experiments in comparison with those which are daily done? and are done daily for nothing. So my employment is, correcting the press of my new edition of the Anatomy, and writing notes for my Physiology, which I mean to make an additional volume to the Anatomy.“
— Charles Bell
Letter to his brother on 1 July 1822; in Letters of Sir Charles Bell, K.H., F.R.S.L. & E. , London: John Murray, 1870, pp. 275 https://books.google.it/books?id=UZ1cAAAAcAAJ&pg=PA275-276.