Such men are men of genius of the first rank.

They renew, increase, or modify both science and art.

But Desplein is merely a man whose vast talent consists in properly applying laws already known; in observing, by means of a natural gift, the limits laid down for each temperament, and the time appointed by Nature for an operation.
He has not founded, like Hippocrates, the science itself.

He has invented no system, as did Galen, Broussais, and Rasori.

He is merely an executive genius, like Moscheles on the piano, Paganini on the violin, or Farinelli on his own larynx,--men who have developed enormous faculties, but who have not created music.