He lived in retirement in Paris, where he occupied himself until his death in 1845 in writing a book entitled _Sejour d'un Membre de l'Institut de France aux Etats-Unis pendant vingt-deux ans_.

The manuscript mysteriously disappeared, no trace of it ever having been found.

(Larousse, _Grand Dictionnaire Universel_, Art.

LAKANAL.) His bust now occupies a prominent place among those of other great men in the French Academy of Sciences.
[30] This is seen to be the case by the title of the pamphlet: _Memoire sur les Cabinets d'Histoire Naturelle, et particulierement sur celui du Jardin des Plantes_.
[31] Bourguin also adds that "on one point Lamarck, with more foresight, went farther than Lakanal.

He had insisted on the necessity of the appointment of four demonstrators for zooelogy.