 Napoleon in turn invited them to follow him to Egypt (1798-1799) and instructed Berthollet to conduct the recruitment of the scientists that were to compose the "Institut d'Egypte".The way Berthollet effectively directed the practical installation of the Institute at Qassim Bey's Palace in Caïro, cemented the friendship with Bonaparte in a way that proved its worth in the patronage of the Arcueil Society.When Berthollet, in 1807, concluded that the arrangement for research facilities at Arcueil had cost him more than he could afford, Napoleon, alerted by Laplace and Monge, immediately lend him 150.000 francs to break even.