Before revision: Invited regularly to the Laboratoire Arago since 1884 by Lacaze-Duthiers, French marine biologist Louis Boutan developed while working there, from 1893 , several techniques for underwater photography.
After revision: Invited regularly to the Laboratoire Arago since 1884 by Lacaze-Duthiers, French marine biologist Louis Boutan perfected while studying under de Lacaze-Duthiers , several techniques for underwater photography.