Hettner forgets his own chronological data when he maintains that Lamettrie, instigated chiefly by Diderot's 'Pensées Philosophiques,' wrote in 1745 the 'Histoire Naturelle de l'Ame,' and in 1748 'L'Homme Machine;' and in Schlosser's ' History of the World' we may read that Lamettrie was a very ignorant man, who had the impudence to pass off the discoveries and observations of others as his own. Only that in nearly every case where we find a striking similarity of ideas between Lamettrie and any famous contemporary of his, the former had an indisputable priority!