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Compilation of three stock films presenting Jean Perrin (1870-1942), a physicist, member of the Institute and Nobel laureate, who dedicated his life to the study of atoms and molecules: a speech given at the occasion of the 40th birthday of the discover of radium, and two films directed by Jean Perrin himself in 1923, dealing with the Brownian motion and the liquid thin films.

In 1938, during the International Cancer Week and the fortieth anniversary of the discovery of radium, physicist Jean Perrin delivered a speech in Marie Curie's garden at the Radium Institute. Using the example of Pierre and Marie Curie's discovery of radium and its therapeutic application against cancer, he stressed the importance of selfless scientific research and called for donations.

Mute film shot in 1923, by the physicist and Nobel laureate Jean Perrin, at the Sorbonne laboratory for physical chemistry. It explains the Brownian motion and shows the techniques of preparation of emulsions.