Abstract

It is not known, when H. Brand, the discoverer of phosphorus, died; until now we have only known that he was still alive in 1692. In the following article a letter from Brand to Leibniz written in 1698 is published; two more letters to Leibniz written in 1699 mentioning Brand are also quoted. In addition a manuscript by Leibniz concerning the discovery of phosphorus is published, which helps to settle the question of when phosphorus was discovered