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He has made other valuable contributions to Theoretical Physics, among these being a theory of the Brownian movements and various important applications of the modern quantum theory of energy.

Brownian movements have already yielded up their dances to the motion picture camera.

Note the locomotive activity of M. agilis and the Brownian movement of the remaining micrococci.

Many bacteria when suspended in a fluid exhibit a power of independent movement which is, of course, quite distinct from the Brownian movement—a non-vital phenomenon common to all finely-divided particles suspended in a fluid.

This incessant movement in the world of molecules is called the Brownian movement, and is a striking proof of the reality of molecular motions.