This was agreed to.
The next reference, and the only explicit one, is that in the records for May 23, 1826, as follows: "Vu la cecite dont M.de Lamarck est frappe, M.Bosc[42] continuera d'exercer sur les parties confiert a M.Audouin la surveillance attribuee au Professeur." But, according to Duval, long before this he had been unable to use his eyes.

In his _Systeme analytique des Connaissances positives de l'Homme_, published in 1820, he refers to the sudden loss of his eyesight.
Even in advanced life Lamarck seems not to have suffered from ill-health, despite the fact that he apparently during the last thirty years of his life lived in a very secluded way.

Whether he went out into the world, to the theatre, or even went away from Paris and the Museum into the country in his later years, is a matter of doubt.

It is said that he was fond of novels, his daughters reading to him those of the best French authors.

After looking with some care through the records of the sessions of the Assembly of Professors, we are struck with the evidences of his devotion to routine museum work and to his courses of lectures.
At that time the Museum sent out to the _Ecoles centrales_ of the different departments of France named collections made up from the duplicates, and in this sort of drudgery Lamarck took an active part.