For the 1769 transit, Jean Chappe d’Auteroche led a party to the southern tip of Baja California. They observed the transit under ideal conditions, but a few days later an epidemic struck the area, killing three-fourths of the local population and everyone in the expedition except for Chappe and Pauly, his engineer. Chappe lingered for a short while but died before leaving Baja. Pauly managed to get back to France with all of the observation records