This is a bas-relief bust of <a href="https://en.wikipedia.org/wiki/Joseph_Louis_Gay-Lussac" class="extiw" title="en:Joseph Louis Gay-Lussac">Joseph Louis Gay-Lussac</a> who was a French chemist and physicist, found on the façade of the <i>grande galerie de l'Évolution</i>, in the <i>Jardin des plantes</i>, in Paris.
<a href="//commons.wikimedia.org/wiki/User:Eutouring" title="User:Eutouring">Eutouring</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>