He afterwards accepted the situation of secretary to count de Brenner, which afforded him an opportunity of seeing Germany and Italy.
In Italy, he formed a friendship with Lorgna, professor of mathematics at Verona, and one of the founders of the Società Italiana for the encouragement of the sciences.
He was also made corresponding member of the royal society of Turin; and, while residing at Venice, he was, through the friendly representation of Nicolaus von Fuss, admitted into the academy of St Petersburg.
He drowned while bathing in the Neva in July 1789, a few months after his marriage to a granddaughter of Leonhard Euler.
He also published separately some juridical and physical theses, and a German translation of Mémoires du philosophe de Merian.