Guitry reprises his role as Pasteur which he played successfully at the Vaudeville Theatre in 1919.
Acting
Guitry's theatrical magnetism carries every scene he inhabits.
Writing
Witty dialogue that makes science debates feel like drawing-room comedy.

Director
Sacha Guitry
Trivia, insights & behind the scenes
Guitry filmed this in 1935 but had played Pasteur on stage sixteen years earlier — he was literally reprising a role from before the Jazz Age.
This arrived when France was rebuilding scientific pride after WWI's medical horrors; Pasteur became national myth as much as man.