1. The Society of Arcueil
2. This was not only the criticism by Kant, but also the self-criticism by Newton himself. Newton wrote to R. T. Bentley, ‘You sometimes speak of gravity as essential and inherent to matter. Pray, do not ascribe that notion to me; for the cause of gravity is what I do not pretend to know, and therefore would take more time to consider it’, and Pemberton, a pupil of Newton, added, ‘To acquiesce in the explanation of any appearance by asserting it to be a general power of attraction, is not to improve our knowledge in philosophy, but rather to put a stop to our farther search.’ Newton's second letter to Richard Bentley 1692–1693, The Works of Richard Bentley London 1838 210 210