[John Percy, metallurgist.] Autograph Letter Signed ('J. Percy') to society homeopathist, making a long transcription from his 'Metallurgy of Lead'.

2pp., 12mo. Bifolium. In fair condition, lightly aged, with traces of mount adhering to blank reverse of second leaf. Addressed to 'Dear Dr.' and written in a neat and close hand. He gives a 22-line transcription of 'the extract [] from my vol[um]e. on Lead, p.177, published in 1870', headed 'Refining or Cupellation'.