Recent investigations have made the kinetic theory of fluids one of the most vital branches of theoretical physics. Experimental progress has gone hand in hand with the development of theory.

Brownian provides evidence for the kinetic particle model of matter ... the first pieces of experimental evidence for the particle theory. By pouring mercury into a J-shaped tube that was sealed ...

THE difficulty of reconciling line spectra with the kinetic theory of gases, has been referred to by Prof. Fitzgerald (NATURE, January 3, p. 221). The following considerations show that it is ...