Appendix, 'A supplement to the account of the Pediculus pulsatorius, or death-watch published in Philosophical Transactions number 271, serving to the more perfect natural history of that insect' by William Derham Derham provides observations on the death-watch beetle, with a particular focus on its generation. Subject: Zoology / Entomology Original account published in Philosophical Transactions as 'A letter from the Reverend Mr William Derham to the publisher, concerning an insect that is commonly called the death-watch' Read to the Royal Society on 26 April 1704 April 1704