1895. Discovery of X-rays. Researchers and scholars are true martyrs, because they do not know how to protect themselves against radiation dermatitis. Professor Belcour has to have one hand amputated, his assistant Henri Vermont, aware of the danger, has the courage to break up with his fiancée. Withdrawn to the countryside, they eventually recover.
| Actor | Role |
|---|---|
 Madeleine SologneMadeleine | Madeleine |
 Claude DauphinHenri Vermont | Henri Vermont |
 Jean MuratProfessor Bellecour | Professor Bellecour |
 Janine DarceyDenise | Denise |
 Pierrette CaillolPrecursor | Precursor |
 Gérard LandryJacques Monval | Jacques Monval |
 Marthe RégnierSick woman | Sick woman |
| GGeorges AlainPierre | Pierre |
 Jean d'YdDoctor | Doctor |
| LLucien DalmasSinger | Singer |
 Jean DaurandJoseph | Joseph |
| RRoger HédouinNot listed | Not listed |
 Georges LannesGérard | Gérard |
| EEmmi LaurenceNot listed | Not listed |
 Jean-François MartialNot listed | Not listed |
| MMarcel MilletNot listed | Not listed |
| RRené NoëlNot listed | Not listed |
| AArlette PerretièreNot listed | Not listed |
| JJean StollDancer | Dancer |
| MMaurice TricardMadeleine's father | Madeleine's father |
| MMichèle VerneuilNot listed | Not listed |
| PPierrette VialNot listed | Not listed |