1. [James Keir] The first part of a dictionary of chemistry & c. (Pearson & Rollason Birmingham 1789) p. iii.
2. On vitriolated tartar see William Lewis A course of practical chemistry. In which are contained all the operations described in Wilson's Complete course of chemistry (for J. Nourse London 1746) p. 305.
3. Keele University Wedgwood MSS. E1-694. Keir to Thomas Wedgwood 17 March 1792. I wish to thank the Wedgwood Museum and Ms Helen Burton for making these manuscripts available to me.
4. James Watt to Beddoes 2 September 1794 in Thomas Beddoes and James Watt Considerations on the medicinal use and on the production of factitious airs (Part I by Thomas Beddoes M. D.; Part II by James Watt engineer) (J. Johnson London 1796) pp. 113–114.
5. Quoted in Malcolm Oster ‘The scholar and the craftsman revisited: Robert Boyle as aristocrat and artisan’ Ann. Sci. 49 255–276 (1992) esp. at p. 265.