Page 389 of the manuscript L'Ami des arts liberté à lui-même...

Salto Augusto, 2 May 1828
"Very attacked by the disease, Messrs. Langsdorff and Rubzoff remain deprived of the slightest action. So weak are they that it is impossible for them to leave the network. [...] There are only 15 of us who keep ourselves healthy, in a group of 34 people, of whom only eight got rid of the fever."