1798: preparateur to Charles.
(1798): gave a course of general chemistry.
1799-1803: military surgeon.
27/4/03- 1805: surgeon in the Hotel Dieu.
26/2/03: his father wrote to Louis Bonaparte soliciting support in the competition for the post of essayeur at the Monnaie, saying his son 'cultive et enseigne la chime.'
1804: set up a small soda works in Paris, perhaps in association with Haag and Muller.
20/6/05: Pelletan et Cie set up in Rouen with Haag and Muller, merchants of Lubeck, and Jean Michel Kinkelin to make soda.
1809: P left the business to join Jean Holker in a larger venture which closed in 1811.
1813: P returned to Paris to pursue a career as a physician and professor.
16/3/17: leased Farjas' small sulphuric acid works at Issy for 1500 fr per year